Classification of pregnancy manifestations
In modern practice, classic symptoms are divided into three groups:
- Presumptive (suspected): subjective sensations (nausea, morning sickness, taste changes, food odors intolerance, mood swings, drowsiness, frequent urination, breast tenderness, skin pigmentation).
- Probable: objective changes in the reproductive system (cessation of menstruation, appearance of colostrum upon expression, cyanosis of the vaginal and cervical mucosa, enlargement and change in the shape of the uterus).
- Positive (definite): signs that absolutely confirm the presence of a fetus in the uterine cavity.
Specific probable signs on examination
During a gynecological examination in the first trimester, the physician may identify characteristic anatomical changes in the uterus:
- Piskacek's sign: dome-shaped protrusion of one of the uterine horns at the implantation site of the gestational sac, causing asymmetry.
- Hegar's sign: ridge-like thickening along the midline of the anterior surface of the uterus (not always detectable).
- Chadwick's sign: bluish discoloration of the cervix, appearing at 6–8 weeks.
Laboratory diagnostics and ultrasound criteria
Laboratory methods include determining the level of the β-hCG subunit in blood serum. This method allows diagnosing the condition just a few days after implantation.
In multiple pregnancy, ultrasound assessment of chorionicity plays a crucial role:
- Lambda sign (λ-sign): indicates dichorionic placentation (less accessible after 15–16 weeks).
- T-sign: reliably confirms monochorionicity.
Differential diagnosis in early gestation
Early diagnosis is complicated by conditions that can mimic pregnancy (stress, medication use, endocrine disorders). Special attention is required when ectopic pregnancy is suspected, which is differentiated from the following pathologies:
- Spontaneous abortion in intrauterine pregnancy;
- Ovarian apoplexy (rupture of the corpus luteum);
- Acute adnexal inflammation, appendicitis, or ovarian cyst torsion.
Mnemonic for uterine signs: Piskacek — Protrusion of the horn, Hegar — Hump anteriorly, Chadwick — Cyanosis (blueberry color) of the cervix.
Class and exam questions
Which signs are considered presumptive?
These include subjective sensations: morning nausea and vomiting, appetite changes, intolerance to odors, emotional lability, frequent urination, skin pigmentation, and increased abdominal girth.
What is the difference between the λ-sign and the T-sign on ultrasound?
The lambda sign reliably indicates a dichorionic twin pregnancy, while the T-sign points to a monochorionic type of placentation.
What management strategy is chosen when chorionicity cannot be established?
If chorionicity cannot be determined due to late presentation of the patient, such a pregnancy must be managed as monochorionic.
What else to study on this topic
- Assessment of fetal development and detection of chromosomal abnormality markers in the 1st trimester
- Clinical presentation and symptoms of fallopian tube rupture ("Douglas cry", "floating uterus")
- Differential diagnostic criteria for uterine abortion and tubal pregnancy
- Indications for laparoscopy and laparotomy in ectopic pregnancy
- Significance of precise gestational age determination in extragenital diseases
Master the entire topic in the "Obstetrics and Gynecology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Signs of early pregnancy" and 973 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 21 video lessons on the subject
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.