PLAB 1 (UKMLA AKT) obstetrics & gynaecology questions

A positive pregnancy test combined with unilateral pelvic pain, signs of haemodynamic compromise (tachycardia, hypotension, syncope) and peritonism strongly suggests a ruptured ectopic pregnancy until proven otherwise. Prior tubal infection (chlamydia causing tubal scarring) and intrauterine device use are recognised risk factors for ectopic pregnancy because they impair normal embryo transit through the fallopian tube. Any woman of reproductive age with abdominal pain must have pregnancy excluded first, and a positive test with these features mandates urgent gynaecological assessment and likely emergency surgery. Appendicitis and ovarian cyst rupture do not explain the positive pregnancy test.

• A. Appendicitis would not cause a positive pregnancy test and typically has a more gradual onset with anorexia.
• B. PID does not typically cause hypotension and syncope from intraperitoneal bleeding, and the pregnancy test would usually be negative.
• C. Threatened miscarriage does not cause peritonism, guarding or haemodynamic instability.
• E. A ruptured ovarian cyst does not explain the positive pregnancy test.

In a viable intrauterine pregnancy, serum hCG typically rises by at least 63% over 48 hours, whereas a rise of only about 8% here is suboptimal for a healthy pregnancy but too high for a typical miscarriage, in which hCG usually falls by more than 50%. This indeterminate rise in a pregnancy of unknown location raises concern for an ectopic pregnancy, which classically shows a slower rise or plateau. Such women require close monitoring with serial hCG measurements every 48 hours and repeat transvaginal ultrasound once hCG is above the discriminatory zone. Failure to rise appropriately or plateauing should prompt further investigation, as some ectopics present atypically.

• B. A failing intrauterine pregnancy would usually show a falling or plateauing hCG rather than any rise, and this term does not fit the pregnancy of unknown location scenario as precisely.
• C. A normal intrauterine pregnancy would usually show a rise of at least 63% over 48 hours, not 8%.
• D. Molar pregnancy diagnosis requires characteristic ultrasound findings (snowstorm appearance), not simply an hCG value.
• E. A complete miscarriage would typically show a falling hCG of more than 50% over 48 hours.

Methotrexate is appropriate for a clinically stable woman with an unruptured ectopic pregnancy measuring less than 35 mm, no significant pain, no visible fetal heartbeat and a serum hCG level below 1500 IU/L (ideally less than 5000 IU/L per NICE), provided she can attend follow-up and has no contraindications such as renal impairment or breastfeeding. Methotrexate inhibits dihydrofolate reductase, arresting trophoblastic cell division, and avoids surgical risks while preserving the fallopian tube. Expectant management is reserved for very low and declining hCG levels with minimal symptoms. Surgery is preferred when hCG is high, the mass is large, there is significant pain or evidence of rupture.

• B. Immediate surgery is not first-line when the woman is stable and meets criteria for medical management, and would remove the tube unnecessarily.
• C. Expectant management is reserved for hCG levels that are low and falling, not a stable or significant level of 1450 IU/L with a visible mass.
• D. Laparotomy is unnecessarily invasive when laparoscopic or medical approaches are appropriate and she is stable.
• E. Combining methotrexate with surgery is not standard practice and offers no added benefit when criteria for medical management alone are met.

NICE recommends expectant management as the first-line option for miscarriage in a clinically stable woman with no evidence of infection, allowing the body to pass the pregnancy naturally, typically reviewed after 7-14 days with a repeat scan if bleeding has not settled. This avoids the risks associated with surgical or medical intervention and is acceptable when the woman is asymptomatic apart from light bleeding and wishes to avoid procedures. If expectant management fails or is declined, medical management with misoprostol or surgical options (manual vacuum aspiration or evacuation of retained products of conception) should then be offered. Oxytocin infusion is not used for first-trimester miscarriage management.

• A. Manual vacuum aspiration is a surgical option considered after expectant or medical management fails or is declined, not the automatic first step here.
• B. Dilatation and curettage is an outdated term for surgical evacuation and is not first-line when expectant management is appropriate and preferred.
• C. Oxytocin infusion is not indicated for first-trimester miscarriage; it is used in later pregnancy and postpartum settings.
• E. Surgical management under general anaesthetic is not first-line and carries unnecessary anaesthetic risk when the patient is stable and prefers to avoid procedures.

Anti-D immunoglobulin is not routinely required for threatened miscarriage before 12 weeks of gestation in a woman who is otherwise well, as the risk of sensitisation from light bleeding this early is very low and fetal red cell volume is minimal. Anti-D is indicated for Rhesus-negative women with sensitising events after 12 weeks, such as heavier or persistent bleeding, surgical management of miscarriage, ectopic pregnancy managed surgically, or any invasive procedure, regardless of gestation in those cases. A Kleihauer test is used to quantify fetomaternal haemorrhage in later pregnancy, not relevant to this early threatened miscarriage. Routine antenatal anti-D prophylaxis at 28 weeks is given regardless of early bleeding events.

• B. There is no indication for anti-D at all in this scenario, let alone a double dose.
• C. This conflates routine antenatal anti-D prophylaxis at 28 weeks (given regardless of bleeding) with management of a sensitising event, and recurrent bleeding under 12 weeks still does not require anti-D unless surgical management occurs.
• D. The Kleihauer test is used to quantify fetomaternal haemorrhage after sensitising events from 20 weeks of gestation onward, not in early threatened miscarriage.
• E. Anti-D is not indicated for non-surgically managed threatened miscarriage under 12 weeks of gestation.

NICE guidance recommends that the booking appointment, ideally performed by a midwife, should take place by 10 weeks of gestation so that early screening tests, risk assessment and lifestyle advice can be given in good time. The booking visit includes history taking, baseline bloods, blood pressure, urinalysis, BMI calculation and discussion of screening options including the combined test. Earlier booking allows more informed decision-making about antenatal screening pathways. The dating scan is usually arranged for 10-13+6 weeks, after booking has occurred.

• A. The dating scan is scheduled after booking, typically between 10 and 13+6 weeks.
• B. Delaying until 12 weeks would miss the recommended booking window and early screening opportunities.
• C. Routine low-risk pregnancies are managed by midwife-led care, not automatic consultant referral.
• D. Aspirin is only indicated in women with risk factors for pre-eclampsia, not routinely.

The combined test is the first-line screening test for Down syndrome in the UK and is performed between 11+2 and 14+1 weeks of gestation. It combines nuchal translucency measurement on ultrasound with maternal serum beta-hCG and PAPP-A levels, and the results are adjusted for maternal age to give a risk score. If the combined test is missed or not possible (for example due to late booking or an unmeasurable nuchal translucency), the quadruple test is used instead in the second trimester. A high-risk result from the combined test can be followed by diagnostic testing such as chorionic villus sampling or amniocentesis.

• A. Amniocentesis is an invasive diagnostic test, not a screening test, and carries a small miscarriage risk.
• B. Cell-free fetal DNA is a secondary screening option after a high-risk combined test result, not the primary screening test.
• C. This describes the quadruple test, which is used later in the second trimester, not as first-line screening at 11 weeks.
• E. An anomaly scan assesses structural abnormalities and is not used to calculate Down syndrome risk.

NICE diagnostic thresholds for gestational diabetes using a 75 g OGTT are a fasting plasma glucose of 5.6 mmol/L or above, or a 2-hour plasma glucose of 7.8 mmol/L or above. Meeting or exceeding either single threshold is sufficient to make the diagnosis. In this case the fasting value is below threshold but the 2-hour value of 8.2 mmol/L exceeds 7.8 mmol/L, confirming gestational diabetes. Risk factors warranting OGTT testing include BMI above 30 kg/m², previous macrosomic baby, previous gestational diabetes, family history of diabetes, and minority ethnic family origin with high prevalence of diabetes.

• A. The 2-hour value exceeds the diagnostic threshold of 7.8 mmol/L, so this is not a normal result.
• C. Pre-existing (overt) diabetes diagnosed in pregnancy requires much higher thresholds, such as fasting glucose above 7.0 mmol/L.
• D. The result already meets diagnostic criteria using both fasting and 2-hour values; repeating a single value is unnecessary.
• E. There is no intermediate category of impaired glucose tolerance in NICE gestational diabetes criteria; the diagnosis is made now.

Routine antenatal anti-D prophylaxis (RAADP) is offered to all Rh D negative women without pre-formed anti-D antibodies, as a single dose at 28 weeks or as two doses at 28 and 34 weeks depending on local protocol, to reduce the risk of sensitisation from silent fetomaternal haemorrhage. Anti-D is also given after any sensitising event such as bleeding, trauma, amniocentesis or external cephalic version, and again after delivery if the baby is confirmed Rh D positive. Even in a first pregnancy, sensitisation can occur and affect future pregnancies, so prophylaxis is still required.

• A. The standard regimen is a single dose at 28 weeks (or two doses at 28 and 34 weeks), not at 12 and 20 weeks.
• B. Sensitisation in a first pregnancy still poses a risk to future pregnancies, so prophylaxis is indicated.
• D. A single dose at booking does not cover the main window of risk for sensitisation later in pregnancy.
• E. Anti-D at 28 weeks is given regardless of fetal blood group, since this is usually unknown until birth or determined by cell-free DNA testing.

Labetalol is the first-line oral antihypertensive in pregnancy according to NICE guidance, used for both gestational hypertension and pre-eclampsia unless contraindicated, such as in asthma. It acts as a combined alpha and beta blocker and has a well-established safety profile in pregnancy. Nifedipine (modified-release) and methyldopa are alternatives if labetalol is unsuitable. ACE inhibitors and angiotensin receptor blockers are contraindicated throughout pregnancy because they cause fetal renal impairment, oligohydramnios and skull defects.

• A. Thiazide diuretics are not recommended as first-line therapy and may reduce placental perfusion.
• B. Losartan, an angiotensin receptor blocker, is contraindicated in pregnancy for the same reasons as ACE inhibitors.
• C. Atenolol is associated with fetal growth restriction and is not the preferred beta blocker in pregnancy.
• E. Ramipril, an ACE inhibitor, is contraindicated in pregnancy due to fetotoxicity.

Absent reflexes, respiratory depression and reduced consciousness are signs of magnesium toxicity, which can progress to respiratory arrest and cardiac arrest if untreated. The infusion must be stopped immediately and intravenous calcium gluconate given as the specific antidote, as calcium competitively antagonises magnesium at the neuromuscular junction. Patients on magnesium sulfate require regular monitoring of reflexes, respiratory rate and urine output to detect toxicity early. Reducing the rate or waiting is inadequate given the severity of these signs.

• A. Furosemide is not the standard treatment for magnesium toxicity and does not reverse toxicity rapidly enough.
• B. Halving the rate does not address established toxicity and risks further deterioration including respiratory arrest.
• C. Continuing the infusion in the presence of absent reflexes and respiratory depression is unsafe.
• E. Naloxone reverses opioid toxicity, not magnesium toxicity, and would not help here.

The first priority after an eclamptic seizure is basic resuscitation: placing the woman in the left lateral position to protect the airway and reduce aortocaval compression, and giving high-flow oxygen while assessing airway, breathing and circulation. Magnesium sulfate is then given to prevent further seizures, not diazepam, which is reserved for seizures resistant to magnesium. Delivery is considered once the mother is stabilised, not performed emergently before resuscitation. Antihypertensives are used to control blood pressure but are not the immediate first step after a seizure.

• A. Caesarean section is not performed until the mother is stabilised; immediate delivery before resuscitation risks maternal harm.
• C. Cardioversion is irrelevant as there is no arrhythmia, and this is not the immediate priority.
• D. Blood pressure control is important but follows initial airway and breathing management.
• E. Diazepam is not first-line for eclamptic seizures; magnesium sulfate is used after initial resuscitation.

HELLP syndrome is a severe variant of pre-eclampsia characterised by Haemolysis (low haemoglobin, raised lactate dehydrogenase, schistocytes on film), Elevated Liver enzymes, and Low Platelets. This woman's combination of epigastric pain, hypertension, thrombocytopenia, raised transaminases and haemolysis on blood film is classic for HELLP. Acute fatty liver of pregnancy typically causes hypoglycaemia and markedly deranged clotting rather than this haemolytic picture. Management involves stabilisation, magnesium sulfate for seizure prophylaxis, blood pressure control, and expedited delivery.

• A. Viral hepatitis does not explain the thrombocytopenia, haemolysis or hypertension seen in this patient.
• B. Thrombotic thrombocytopenic purpura is not specifically associated with pre-eclampsia and classically includes neurological symptoms and fever.
• C. Disseminated intravascular coagulation would show prolonged clotting times and low fibrinogen, which are not described here.
• E. Acute fatty liver of pregnancy typically presents with hypoglycaemia, coagulopathy and jaundice rather than this pattern of haemolysis.

Painless antepartum haemorrhage with a known low-lying placenta raises strong suspicion of placenta praevia, and digital vaginal examination must be avoided until placental location is confirmed, as it can provoke catastrophic haemorrhage. Transabdominal (followed by transvaginal if needed) ultrasound is the appropriate next step to localise the placenta safely. Management thereafter depends on the degree of praevia and clinical stability, with planned caesarean section usually required if the placenta covers or is close to the cervical os. Digital and speculum examinations are contraindicated until praevia has been excluded.

• A. Artificial rupture of membranes is inappropriate and dangerous if placenta praevia has not been excluded.
• B. Immediate vaginal delivery is not appropriate without first establishing placental location and maternal/fetal stability.
• C. Digital vaginal examination is contraindicated in suspected placenta praevia due to the risk of provoking severe haemorrhage.
• D. Speculum examination carries similar risk and should not be performed before placental location is confirmed.

Placental abruption classically presents with severe, constant abdominal pain, a tense and tender 'woody hard' uterus, and often only a small amount of revealed dark vaginal bleeding because much of the blood can be concealed behind the placenta. This contrasts with placenta praevia, which causes painless bright red bleeding without uterine tenderness or increased tone. The combination of pain, uterine hypertonus and fetal compromise, shown here by fetal bradycardia and reduced variability, indicates a significant abruption requiring urgent senior obstetric involvement and likely emergency delivery. Maternal tachycardia and relative hypotension reflect concealed blood loss.

• A. Preterm labour presents with regular contractions and cervical change rather than a persistently tense, tender uterus.
• B. Vasa praevia presents with painless bleeding at membrane rupture accompanied by acute fetal distress, not a tender woody uterus.
• C. Placenta praevia characteristically causes painless bleeding without uterine tenderness or increased tone, unlike this presentation.
• E. Uterine rupture typically occurs in labour, often with a scarred uterus, and presents with sudden severe pain and loss of contractions, not described here.

Carboprost is a synthetic prostaglandin F2α analogue given intramuscularly (or directly into the myometrium) as third-line uterotonic treatment for atonic PPH unresponsive to oxytocin and ergometrine. It causes sustained myometrial contraction. It is contraindicated in asthma because it can cause bronchospasm, which this patient does not have. Misoprostol and tranexamic acid have supporting roles but carboprost is the standard next step in the stepwise uterotonic ladder according to RCOG guidance.

• A. Tranexamic acid is an antifibrinolytic adjunct given alongside uterotonics, not a substitute for escalating uterotonic therapy.
• B. Misoprostol is typically used when carboprost is unavailable or contraindicated, making it a later option rather than the next step here.
• C. Magnesium sulfate is used for eclampsia prophylaxis and treatment, not for uterine atony.
• D. Terbutaline is a tocolytic and would worsen uterine atony.

In ongoing primary PPH due to atony despite uterotonics, bimanual uterine compression is a simple, immediate mechanical measure that can be performed at the bedside while awaiting further resuscitation and before more invasive interventions. It involves compressing the uterus between a hand in the vagina and a hand on the abdomen to stimulate contraction and reduce blood flow. Balloon tamponade, surgical sutures, embolisation and hysterectomy are escalation steps used if bimanual compression and pharmacological measures fail to control bleeding.

• A. Embolisation is a radiological option used in a stable patient when other measures fail, not an immediate bedside step.
• C. Hysterectomy is a last resort when all other measures to control life-threatening haemorrhage have failed.
• D. B-Lynch suture requires laparotomy and is used when conservative and balloon measures fail.
• E. Balloon tamponade is used after bimanual compression and uterotonics fail, not as the very first mechanical step.

This woman has multiple risk factors for uterine atony, grand multiparity, macrosomia (4.6 kg), prolonged augmented labour, which all contribute to overdistension and exhaustion of the myometrium. Overdistended uterine muscle fibres contract less effectively after delivery, failing to compress the spiral arteries at the placental bed, the key mechanism of atonic PPH. The complete placenta and soft boggy uterus support atony rather than retained tissue, trauma or coagulopathy as the cause.

• B. There is no clinical evidence here of amniotic fluid embolism, such as acute hypoxia or collapse.
• C. A boggy atonic uterus, not a well-contracted one, points away from a laceration as the primary cause of bleeding.
• D. The placenta was delivered complete, making retained products unlikely as the cause.
• E. There is no mention of antenatal low-lying placenta, and this does not explain a boggy uterus after complete delivery of the placenta.

In a standard partogram, the alert line is drawn from 4 cm dilatation assuming a minimum progress rate of 1 cm per hour; the action line is typically four hours to the right of the alert line. Progressing from 4 cm to only 5 cm over 4 hours is slower than the expected 1 cm per hour minimum, meaning her plot would cross the alert line and approach or reach the action line, indicating poor progress that requires review and consideration of amniotomy or oxytocin augmentation. This rate does not yet indicate obstruction, hypertonic contractions or precipitate labour.

• A. There is no evidence of obstruction such as caput, moulding or an unengaged head with cephalopelvic disproportion described here.
• C. Contraction frequency of four in ten minutes is normal, not excessive; hypertonic contractions are not demonstrated.
• D. A dilatation rate of only 0.25 cm per hour is below the expected minimum and should prompt review of progress, not be considered normal.
• E. Precipitate labour refers to very rapid progress and delivery, the opposite of this scenario.

This woman has failure to progress in the first stage of labour, likely due to inadequate uterine activity (only 2 contractions in 10 minutes) with intact membranes. The first step when membranes are intact is amniotomy, as rupturing the membranes can stimulate more effective contractions and allow assessment of liquor; oxytocin augmentation is considered if progress remains poor after amniotomy. Caesarean section and instrumental delivery are not indicated at this stage without a trial of conservative measures, and epidural analgesia does not address the underlying cause of delay.

• A. Epidural analgesia addresses pain, not the inadequate uterine activity causing delay.
• B. The cervix is only 5 cm dilated, so the first stage is not complete and instrumental delivery is not applicable.
• D. Caesarean section is reserved for failed augmentation, obstruction or fetal compromise, not as a first step here.
• E. Oxytocin is considered after amniotomy if contractions remain inadequate, not before rupturing intact membranes.

Late decelerations begin after the onset of a contraction, have a gradual onset and offset, and reach their nadir after the peak of the contraction, with delayed return to baseline. They reflect uteroplacental insufficiency and fetal hypoxia, as the fetal heart rate response to the contraction-induced reduction in oxygen delivery is delayed. This pattern is concerning, especially if repetitive, and warrants further assessment such as fetal blood sampling or expedited delivery depending on the overall clinical picture.

• A. Early decelerations mirror the contraction with onset, nadir and recovery coinciding with the contraction, usually from head compression and are not pathological.
• B. Variable decelerations have a variable relationship to contractions with rapid onset and offset, typically due to cord compression.
• C. Prolonged decelerations last more than 2 to 3 minutes but are defined by duration, not by the timing pattern described here.
• D. A sinusoidal pattern shows a smooth, regular wave-like baseline, unrelated to contractions, often associated with severe fetal anaemia.

Umbilical cord prolapse is an obstetric emergency because cord compression or vasospasm can rapidly cause fetal hypoxia. The immediate priority is to relieve pressure on the cord by repositioning the mother into the knee-chest or exaggerated Sim's (left lateral) position with the presenting part manually elevated, while arranging immediate delivery by category 1 caesarean section (or instrumental delivery if fully dilated with a low head). Tocolytics may be considered to reduce contractions while awaiting delivery, but repositioning and expediting birth are the priorities.

• A. Oxytocin would increase contractions and worsen cord compression, and vaginal delivery is not immediately imminent.
• B. Left lateral positioning alone without urgent transfer for immediate delivery is insufficient; this is a hospital emergency requiring immediate caesarean, not ambulance transfer.
• C. The cord should not be pushed back in or handled roughly as this can worsen vasospasm; fundal pressure is not indicated.
• D. Delaying action for a vaginal examination wastes critical time in a time-sensitive emergency.

NICE recommends offering induction of labour between 41 and 42 weeks of gestation to reduce the risks associated with prolonged pregnancy, such as stillbirth and meconium aspiration. The Bishop score assesses cervical favourability; a low score (long, closed, firm cervix, high station) indicates an unfavourable cervix, so cervical ripening with vaginal prostaglandin E2 is the appropriate first step before considering amniotomy or oxytocin, which are used once the cervix is more favourable.

• A. Artificial rupture of membranes is not feasible or safe with a closed, unfavourable cervix.
• C. Oxytocin alone is ineffective and unsafe without first achieving cervical ripening in an unfavourable cervix.
• D. There is no indication for caesarean section; the pregnancy is uncomplicated with a reassuring CTG.
• E. Routine expectant management beyond 42 weeks is not recommended given increased risk of stillbirth.

Puerperal pyrexia with offensive lochia and uterine tenderness is most commonly caused by endometritis, usually due to ascending infection from the genital tract. High vaginal and endocervical swabs should be taken to identify the causative organism and guide antibiotic therapy, alongside blood cultures and a full septic screen. Pelvic ultrasound may be used later if retained products of conception are suspected, but the initial step is to identify the infective source via swabs.

• A. Blood cultures should be taken as part of a full septic screen, but genital tract swabs are also essential and more specific here.
• B. Urine dipstick alone would miss the likely genital tract source suggested by offensive lochia and uterine tenderness.
• D. Pelvic ultrasound is useful if retained products are suspected but is not the first investigation for suspected endometritis.
• E. Chest X-ray would be indicated if a respiratory source were suspected, which is not suggested by this presentation.

Lactational mastitis without a palpable fluctuant collection is treated with continued breastfeeding (or expressing) to maintain drainage of the affected segment, alongside oral antibiotics such as flucloxacillin if symptoms do not improve within 12 to 24 hours of effective milk removal, or if there are systemic signs such as fever. Continuing to breastfeed does not harm the infant and helps resolve the blockage. Antibiotic choice should cover Staphylococcus aureus, the most common causative organism.

• A. Breastfeeding should be continued, not stopped, as this helps clear the infection and prevents engorgement.
• C. Incision and drainage is only required for a confirmed breast abscess that fails to resolve with aspiration.
• D. Needle aspiration is reserved for cases with a confirmed fluctuant abscess, not for mastitis without a collection.
• E. Fever and significant symptoms warrant antibiotic treatment, not symptomatic measures alone.

Puerperal psychosis typically presents within the first two weeks postpartum with a rapid onset of severe symptoms, including mood disturbance, confusion, agitation, delusions, and sometimes hallucinations. It is a psychiatric emergency requiring urgent specialist perinatal mental health assessment and often inpatient admission, ideally to a mother and baby unit, due to risks to both mother and infant. This contrasts with baby blues, which is mild, self-limiting low mood peaking around day 3-5, and postnatal depression, which typically develops over the first few weeks to months and lacks psychotic features.

• A. Postnatal depression develops more gradually and does not typically include delusions or disorganised behaviour.
• B. Baby blues is mild, transient low mood and tearfulness without psychotic features, usually resolving by day 10.
• C. Generalised anxiety disorder does not explain the delusional beliefs and acute agitation described.
• D. Adjustment disorder would not account for psychotic symptoms such as delusions.

Sertraline is excreted into breast milk in very low concentrations and has the largest body of safety data in lactation, making it a first-choice SSRI for breastfeeding mothers. Fluoxetine has a long half-life and active metabolites that accumulate in the infant, so it is less preferred. Citalopram is excreted in relatively higher amounts in breast milk than sertraline. Doxepin is specifically avoided in breastfeeding because of case reports of infant sedation and respiratory depression.

• A. Citalopram passes into breast milk in higher relative amounts than sertraline.
• B. Doxepin is contraindicated in breastfeeding due to reports of infant sedation and apnoea.
• D. Fluoxetine has a long half-life and active metabolites that can accumulate in the breastfed infant.
• E. Clomipramine is a tricyclic with limited lactation safety data and is not first-line.

This woman has multiple risk factors for venous thromboembolism (emergency caesarean section, obesity, smoking), placing her in an intermediate-risk category according to RCOG guidance, which recommends prophylactic low molecular weight heparin for at least 10 days postpartum. Six weeks of prophylaxis is reserved for women with higher-risk factors such as three or more risk factors or a previous VTE. Warfarin is avoided postpartum thromboprophylaxis in favour of low molecular weight heparin, which is also compatible with breastfeeding. Aspirin has no role in postpartum VTE prophylaxis. Given her risk factors, mechanical measures and mobilisation alone are insufficient.

• A. Warfarin is not used for postpartum thromboprophylaxis; LMWH is preferred and is safe in breastfeeding.
• B. Six weeks of prophylaxis is reserved for women with higher cumulative risk, such as three or more risk factors.
• C. Her combination of risk factors means pharmacological prophylaxis is indicated, not mobilisation alone.
• E. Aspirin is not recommended for postpartum VTE prophylaxis.

NICE guidance recommends the levonorgestrel-releasing intrauterine system (LNG-IUS) as first-line treatment for heavy menstrual bleeding where no structural or histological abnormality is present, as it reduces blood loss more effectively than other medical options and provides long-term contraception. The combined pill and tranexamic acid are reasonable alternatives if the LNG-IUS is declined or unsuitable, but they are not first-line. Oral norethisterone taken during the luteal phase can reduce bleeding but is less effective and not first-line. Mefenamic acid helps with bleeding and pain but is less effective than the LNG-IUS at reducing blood loss.

• A. The combined pill is an option if the LNG-IUS is unsuitable or declined, but it is not first-line.
• C. Tranexamic acid reduces blood loss but is less effective than the LNG-IUS and is a second-line option.
• D. Norethisterone is less effective at reducing menstrual blood loss and is not first-line therapy.
• E. Mefenamic acid helps with pain and modestly reduces bleeding but is not as effective as the LNG-IUS.

Transvaginal ultrasound is the first-line imaging investigation for a suspected uterine fibroid, as it is widely available, inexpensive, and highly sensitive for detecting fibroids and assessing their size and location. MRI is reserved for surgical planning, suspected sarcoma, or when ultrasound findings are inconclusive, particularly before myomectomy or uterine artery embolisation. Hysteroscopy is useful for assessing submucosal fibroids and endometrial pathology but is not first-line for initial diagnosis. Laparoscopy is invasive and unnecessary for initial diagnosis. CT has no significant advantage over ultrasound for pelvic fibroid imaging and involves ionising radiation.

• A. MRI is reserved for surgical planning or when ultrasound is inconclusive, not as the initial test.
• C. Hysteroscopy is used to assess the endometrial cavity, not as the first-line imaging investigation.
• D. Laparoscopy is invasive and not required for initial diagnosis of a fibroid.
• E. CT offers no advantage over ultrasound and involves unnecessary ionising radiation.

Diagnostic laparoscopy remains the gold-standard investigation for confirming endometriosis, allowing direct visualisation of peritoneal and ovarian lesions and the opportunity for simultaneous excision or ablation of deposits. Ultrasound can support the diagnosis when deep infiltrating disease or endometriomas are present, but a normal scan does not exclude endometriosis, and repeating it is not the appropriate next step. MRI can help map deep infiltrating disease before surgery but is not diagnostic on its own. CA-125 may be elevated in endometriosis but is neither sensitive nor specific enough for diagnosis. Hysteroscopy assesses the endometrial cavity and has no role in diagnosing endometriosis.

• A. Hysteroscopy evaluates the uterine cavity and has no role in diagnosing endometriosis.
• B. A normal ultrasound does not exclude endometriosis, and repeating it will not provide a diagnosis.
• C. CA-125 lacks the sensitivity and specificity required for diagnosis.
• E. MRI can help with surgical planning for deep disease but is not the definitive diagnostic test.

Adenomyosis presents with a diffusely enlarged, globular, tender uterus and cyclical pain that is often more diffuse than the localised pressure symptoms of fibroids, with ultrasound showing a poorly defined junctional zone and myometrial cysts rather than a discrete mass. Fibroids typically present with a focal, well-defined mass and a firm but non-tender uterus on examination. Endometrial polyps usually cause intermenstrual bleeding rather than diffuse pain and are not associated with uterine enlargement. Endometrial carcinoma typically presents with postmenopausal or irregular bleeding, not this pattern. Chronic pelvic inflammatory disease usually causes adnexal tenderness and a history of infection rather than diffuse uterine enlargement with this ultrasound appearance.

• A. Endometrial carcinoma typically presents with abnormal bleeding rather than this pain and ultrasound pattern.
• B. Fibroids typically present as a discrete focal mass on a non-tender uterus, unlike the diffuse changes described.
• C. Chronic PID typically causes adnexal tenderness with an infective history, not this uterine appearance.
• E. Endometrial polyps cause intermenstrual bleeding and do not cause diffuse uterine enlargement.

Primary dysmenorrhoea is caused by excess endometrial prostaglandin production driving uterine contractions, so first-line treatment is an NSAID such as ibuprofen or mefenamic acid, which inhibits prostaglandin synthesis and effectively reduces pain. Paracetamol can be used if NSAIDs are contraindicated but is less effective because it does not target the prostaglandin mechanism. The combined pill is an effective second-line option, particularly if contraception is also desired, but NSAIDs are tried first. Tranexamic acid treats heavy bleeding rather than pain and is not indicated here. The LNG-IUS is not appropriate first-line treatment for a young person with primary dysmenorrhoea and normal bleeding.

• A. Tranexamic acid treats heavy menstrual bleeding, not dysmenorrhoea, and her bleeding is not heavy.
• B. Paracetamol is less effective than NSAIDs because it does not inhibit prostaglandin synthesis.
• C. The LNG-IUS is not first-line for primary dysmenorrhoea, especially with normal menstrual flow.
• E. The combined pill is an effective second-line option but NSAIDs are tried first.

Rotterdam criteria require two of three features: oligo/anovulation, clinical or biochemical hyperandrogenism, and polycystic ovaries on ultrasound (12 or more follicles of 2-9 mm in one ovary, or ovarian volume over 10 mL). This patient has oligomenorrhoea, hirsutism, and polycystic morphology in one ovary, meeting all three criteria after exclusion of other causes. Other endocrine causes of hyperandrogenism have been excluded by normal prolactin and TSH and the clinical picture. The diagnosis does not require bilateral polycystic ovaries.

• A. Cushing syndrome would present with additional features such as central obesity, striae and hypertension.
• C. Premature ovarian insufficiency causes amenorrhoea with raised FSH, not the hyperandrogenic picture described here.
• D. An androgen-secreting tumour usually causes rapid-onset severe virilisation with much higher testosterone levels.
• E. Congenital adrenal hyperplasia typically presents earlier with more severe virilisation and would show elevated 17-hydroxyprogesterone.

In women with PCOS and obesity, weight loss is first-line management for subfertility because it can restore ovulation and improve the chances of conception without pharmacological intervention. NICE guidance recommends weight loss as the initial step before offering ovulation induction agents, since even a 5-10% reduction in body weight can restore regular ovulation. Clomifene and letrozole are used once weight optimisation has not achieved conception or pregnancy. IVF is reserved for failure of simpler measures.

• A. Clomifene is appropriate only after lifestyle measures such as weight loss have been tried or in women who are not significantly overweight.
• B. Letrozole may be used as an alternative to clomifene but weight loss should be addressed first given this patient's BMI.
• C. Metformin alone is not first-line for ovulation induction and is usually reserved for specific situations or combined with clomifene if resistant.
• E. IVF is a later-line option reserved for cases where ovulation induction has failed.

This presentation of lower abdominal pain, cervical motion tenderness and adnexal tenderness with mucopurulent discharge is classic for pelvic inflammatory disease. BASHH and NICE guidance recommend empirical treatment with a single dose of intramuscular ceftriaxone to cover gonorrhoea, combined with 14 days of oral doxycycline and metronidazole to cover chlamydia and anaerobic organisms respectively. Treatment should be started empirically on clinical suspicion without waiting for swab results because of the risk of long-term sequelae such as tubal infertility. Pregnancy must be excluded before treatment, which has been done here.

• A. Azithromycin alone does not provide adequate cover for gonorrhoea or anaerobic organisms and is insufficient monotherapy for PID.
• B. Co-amoxiclav alone does not reliably cover chlamydia and is not the recommended first-line regimen for PID.
• D. Flucloxacillin and metronidazole do not cover chlamydia or gonorrhoea, the key causative organisms in PID.
• E. Intravenous benzylpenicillin alone does not cover chlamydia or gonorrhoea and is not appropriate as sole therapy.

Bacterial vaginosis is characterised by a thin, grey-white, malodorous (fishy-smelling) discharge without significant itching or inflammation, caused by overgrowth of anaerobic organisms such as Gardnerella vaginalis replacing normal lactobacilli. The raised vaginal pH above 4.5 supports this diagnosis, as lactobacilli normally maintain an acidic environment. Candidiasis typically causes thick, white, curd-like discharge with itching and vulval erythema, while trichomoniasis causes a frothy yellow-green discharge with vulvovaginal irritation and a strawberry cervix. Diagnosis can be supported by the Amsel criteria, including a positive whiff test with added potassium hydroxide.

• B. Chlamydial cervicitis is often asymptomatic or causes mucopurulent cervical discharge without the fishy odour and raised pH typical of this case.
• C. Candidiasis causes thick, white, non-malodorous discharge with itching, which is absent in this presentation.
• D. Trichomoniasis typically causes frothy, yellow-green discharge with irritation, not the fishy odour and thin grey discharge described here.
• E. Atrophic vaginitis occurs in postmenopausal women due to oestrogen deficiency and presents with dryness and spotting, not malodorous discharge.

Ovarian torsion should be suspected with sudden severe unilateral pelvic pain, vomiting and tachycardia, especially in a woman with a known ovarian mass such as a dermoid cyst, which is a recognised risk factor. Transvaginal ultrasound with Doppler is the first-line imaging investigation, assessing ovarian size, free fluid, and blood flow, though reduced or absent flow is not always present and clinical suspicion should guide management even with normal Doppler findings. Prompt imaging helps guide the decision for urgent laparoscopy without unnecessary delay, as torsion is a time-critical surgical emergency where delay risks ovarian necrosis.

• A. Abdominal X-ray has no role in diagnosing ovarian torsion.
• B. CA-125 is a tumour marker used in suspected malignancy, not useful or appropriate in acute suspected torsion.
• D. Diagnostic laparoscopy is the definitive management but imaging should be obtained first where feasible to support the diagnosis and surgical planning unless the patient is unstable.
• E. CT involves radiation and is not the first-line modality for suspected ovarian torsion in a young woman; ultrasound is preferred.

The copper intrauterine device is the most effective method of emergency contraception, with a failure rate of less than 1%, and can be inserted up to 5 days after unprotected intercourse or up to 5 days after the earliest estimated date of ovulation, whichever is later, making it suitable here at day 4. Levonorgestrel is licensed only up to 72 hours (3 days) after intercourse, so it is outside its licensed window in this scenario. Ulipristal acetate is licensed up to 120 hours (5 days), so it remains an option, but it is less effective than the copper IUD, particularly as ovulation has already occurred, since ulipristal and levonorgestrel work primarily by delaying ovulation rather than acting after it has occurred.

• A. Levonorgestrel is only licensed for use up to 72 hours after unprotected intercourse, so it cannot be used at 4 days.
• B. Mifepristone at this low dose is not a standard licensed emergency contraception method in the UK.
• C. The progestogen-only pill is not used as emergency contraception in this way and has no established efficacy for this indication.
• E. Ulipristal acetate remains within its licensed window of 120 hours but is less effective than the copper IUD once ovulation has already occurred, as its mechanism relies on delaying ovulation.

Couples who have not conceived after 12 months of regular unprotected intercourse should be offered basic fertility investigations in primary care. These include semen analysis for the male partner and a mid-luteal phase (day 21 in a 28-day cycle) serum progesterone to assess for ovulation in the female partner. Further specialist investigations and treatments are only indicated after these initial results are available and an underlying cause is suspected. Earlier referral is appropriate only if risk factors for infertility are present (e.g. age over 36 years, known reproductive pathology).

• A. IVF is a treatment of last resort, not an initial step before basic investigations have been performed.
• B. Hysterosalpingography is a second-line test used to assess tubal patency after initial results, not a first step.
• C. Ovulation induction should not be started before confirming the woman is anovulatory and before semen analysis is reviewed.
• E. Fourteen months of unprotected intercourse already meets the threshold for investigation; further delay is inappropriate.

All women with postmenopausal bleeding should be referred urgently for investigation to exclude endometrial cancer. Transvaginal ultrasound is the first-line test, measuring endometrial thickness; a thickness of 4 mm or less has a high negative predictive value for endometrial cancer, making biopsy unnecessary in low-risk cases. If the endometrium is thickened or ultrasound is inconclusive, hysteroscopy with endometrial biopsy is then performed. MRI and CA125 are used for staging once cancer is diagnosed, not as first-line tests.

• A. Biopsy is reserved for cases where ultrasound shows a thickened or abnormal endometrium, not as the first test.
• B. CA125 is used to monitor or stage suspected ovarian malignancy, not as a first-line test for postmenopausal bleeding.
• D. MRI is used for staging once malignancy is confirmed, not for initial assessment.
• E. A cervical smear screens for cervical dysplasia and does not investigate the cause of postmenopausal bleeding.

In the NHS cervical screening programme, samples are tested for high-risk HPV first; if HPV is positive, cytology is then examined. If HPV is positive but cytology is normal (no dyskaryosis), the woman is recalled for a repeat HPV test in 12 months rather than being referred immediately for colposcopy. If HPV remains positive at 12 months with normal cytology, a further repeat is done at 24 months; persistent HPV positivity at 24 months prompts colposcopy referral. Colposcopy is reserved for HPV-positive samples with abnormal cytology, or persistent HPV positivity over two years.

• B. HPV-positive women are not returned to routine 3-yearly recall; they require closer surveillance.
• C. Excisional treatment is not performed without colposcopic assessment and a tissue diagnosis.
• D. Colposcopy is indicated for HPV-positive samples with abnormal cytology or persistent HPV positivity at 24 months, not after a single HPV-positive, cytology-normal result.
• E. The screening pathway re-tests for HPV, not cytology alone, and the interval is 12 months, not 6.

In obese postmenopausal women, adipose tissue converts androgens to oestrogen via aromatase, and because ovulation has ceased there is no corpus luteum to produce progesterone to oppose this oestrogenic stimulation of the endometrium. This unopposed oestrogen drives endometrial hyperplasia, which can progress to endometrial carcinoma. Obesity and type 2 diabetes are well-established risk factors for endometrial cancer largely through this mechanism of unopposed peripheral oestrogen production. Hyperinsulinaemia contributes indirectly by increasing free oestrogen bioavailability rather than by the mechanisms listed as distractors.

• A. Anovulation leads to a lack of progestogen, not progestogen excess, which removes the protective opposition to oestrogen.
• C. This is not the accepted mechanism; the key driver is unopposed oestrogen exposure rather than direct suppression of apoptosis by insulin.
• D. Obesity typically reduces, not increases, sex hormone-binding globulin, which raises free oestrogen levels and increases risk.
• E. Progestogen, which is protective, is deficient in this scenario, not increased by insulin action on receptors.

Long-standing lichen sclerosus is a recognised risk factor for vulval squamous cell carcinoma, which should be suspected in any patient with chronic lichen sclerosus who develops a new, persistent, non-healing ulcer or lump that fails to respond to standard topical steroid treatment. Features such as bleeding, ulceration and lack of response to treatment are red flags requiring urgent biopsy and referral to a gynaecological oncology service. Malignant transformation occurs in a small but significant proportion of lichen sclerosus cases, usually after many years. Other vulval lesions are less strongly linked to lichen sclerosus and would not typically present this way.

• A. Candidal vulvovaginitis causes erythema and itching but not a persistent ulcerated lesion unresponsive to steroids.
• B. Extramammary Paget's disease is rare and usually presents as an eczematous, well-demarcated plaque rather than an ulcerated lesion arising on a background of lichen sclerosus.
• C. Vulval melanoma is not specifically associated with lichen sclerosus and typically presents as a pigmented lesion rather than an ulcer in this context.
• D. A Bartholin's abscess presents as an acutely painful, fluctuant swelling near the posterior introitus, not a chronic ulcer on the labium majus.

Progestogen is added to HRT specifically to protect the endometrium from the proliferative effects of unopposed oestrogen, which can cause endometrial hyperplasia and increase the risk of endometrial cancer. A woman who has had a total hysterectomy has no endometrium at risk, so oestrogen-only HRT is appropriate and avoids the additional risks associated with progestogens, such as a higher breast cancer risk with combined preparations. Combined regimens, whether cyclical or continuous, are reserved for women who still have a uterus and therefore require endometrial protection.

• A. Cyclical combined HRT is used in women with a uterus who are perimenopausal with ongoing cycles, which does not apply here.
• B. Tibolone with added progestogen is unnecessary when there is no uterus requiring endometrial protection.
• C. Progestogen-only HRT is not a standard regimen for managing vasomotor menopausal symptoms.
• D. Continuous combined HRT is used in women with a uterus to protect the endometrium, which is unnecessary after hysterectomy and adds avoidable progestogen-related risk.

Oral oestrogen increases hepatic synthesis of several clotting factors (including factors VII, VIII, X and fibrinogen) and reduces natural anticoagulants such as antithrombin, tipping the haemostatic balance towards a procoagulant state. This is the mechanism behind the well-recognised increased risk of venous thromboembolism with oral combined HRT, which is highest in the first year of use. Transdermal oestrogen avoids first-pass hepatic metabolism and carries a lower VTE risk, which is why it is preferred in women with risk factors. This patient's presentation, unilateral calf swelling and tenderness, is consistent with a deep vein thrombosis and warrants urgent further assessment with a Wells score and D-dimer or ultrasound as appropriate.

• A. Platelet aggregation at injury sites is a normal haemostatic response, not the mechanism of HRT-associated VTE.
• B. Progestogens are not associated with erythrocytosis or significant viscosity changes in this context.
• D. Venous stasis is not the primary mechanism by which HRT increases thrombotic risk.
• E. Oestrogen does not cause direct endothelial toxicity; its prothrombotic effect is via hepatic clotting factor synthesis.