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EAU 2024 proposal: simplified definitions of uncomplicated vs complicated UTI

This EAU Urological Infections Guidelines Panel paper proposes a simplified, clinically practical way to classify UTIs as uncomplicated or complicated, moving away from the older, more fragmented classification systems that relied on long lists of risk factors. The core message is that classification should focus on whether a functional or anatomical abnormality of the urinary tract or host factors meaningfully increase the risk of a complicated course or treatment failure, rather than mechanically ticking boxes on a risk-factor checklist.

EAU2024 editionSummary
Official guidelineKeep it Simple: A Proposal for a New Definition of Uncomplicated and Complicated Urinary Tract Infections from the EAU Urological Infections Guidelines Panel. EAU, 2024.
Read the official guideline · Checked for a newer edition on 2026-10-26
We do not reproduce the guideline text — this page is an independent summary.

Who it applies to

Adults presenting with symptoms of urinary tract infection in both primary care and urology/specialist settings.

Key recommendations

  • Uncomplicated UTI is defined as infection in a patient with a structurally and functionally normal urinary tract and no relevant comorbidity that increases risk of a complicated course.
  • Complicated UTI is defined by the presence of a factor, anatomical, functional, or host-related, that increases the risk of treatment failure or a more severe clinical course.
  • The panel moves away from simply labelling UTI as complicated based on a long checklist of traditional risk factors (e.g. male sex, pregnancy, catheter, diabetes) and instead asks clinicians to judge whether the factor actually increases risk in that individual.
  • Pregnancy and the presence of a urinary catheter are discussed as examples where risk needs individualised judgement rather than automatic classification as complicated.
  • The paper argues that overly broad complicated-UTI definitions have led to overtreatment and inconsistent antibiotic choices, contributing to antimicrobial resistance pressures.
  • A simplified binary framework is intended to improve consistency of diagnosis, treatment selection, and comparability of research and clinical trials.
  • The classification is meant to guide decisions on need for imaging, duration of antibiotic therapy, and follow-up intensity, rather than being an academic exercise alone.

What is new in this edition

  • Introduces a conceptual shift from a risk-factor checklist model to a judgement-based model asking whether a factor truly elevates risk of complication
  • Explicitly revisits long-standing assumptions (e.g. that all male UTIs or all catheter-associated UTIs are automatically complicated)

Practice points for students

  • Think of complicated UTI as 'a factor that meaningfully raises risk of failure or severe course', not just matching a checklist item
  • Not every traditional 'risk factor' (sex, catheter, pregnancy) automatically makes a UTI complicated; clinical context matters
  • This reclassification affects choice and duration of antibiotics and whether further urological work-up is warranted
  • Useful for exams testing understanding of UTI classification logic rather than rote memorisation of risk-factor lists

Condition

Urinary tract infection

Other guidelines on this topic

Independent educational summary written by the WhiteCoat Pro editorial team with AI assistance and checked by a second AI model. It does not reproduce the guideline text, tables or figures, and it is not affiliated with or endorsed by EAU. It is not medical advice: always read the original guideline before applying it to patients.