Free Module 3 · Urinary tract infections

Urine culture interpretation

Author and medical review: Dr. Leonardo Romeo, urologist (physician) · Last updated:

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Introduction

Why it matters Knowing how to read a urine culture is one of the most useful practical skills in the module: not every positive culture should be treated, and the antibiogram has more nuances than the S/I/R letter.
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Video lesson

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Video pending upload (embedded YouTube)
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Summary

What does a urine culture report?

  • Which microorganism is present.
  • How much grew (colony count).
  • Which antibiotics it is sensitive or resistant to.

Before interpreting it, ask

  1. Does the patient have symptoms?
  2. How was the sample collected?
  3. Is it a complicated or uncomplicated infection?
  4. Are there associated risk factors?

Common mistake

"Positive urine culture = antibiotic." Incorrect. Asymptomatic bacteriuria generally should not be treated.

When is culture especially important?

  • Pregnancy.
  • Before urological procedures.
  • Recurrent UTI.
  • Complicated UTI.
  • Failure of empirical treatment.
  • Pyelonephritis.
  • Patients with catheters or urinary devices.

S – I – R: interpreting the antibiogram with nuance

Beyond the letter (Susceptible, Intermediate, Resistant), you also need to consider:

  • The severity of the clinical picture.
  • The available route of administration.
  • The penetration of the antibiotic into the urinary tract.
  • The patient's adverse effects and contraindications.
  • Local resistance patterns.
  • Cost and availability.
  • The principle of de-escalation whenever possible.
  • The appropriate duration of treatment.
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PDF

⬇ Download module guide (PDF)

Urinary tract infections — Guide for Medicine: uncomplicated and complicated UTI, pyelonephritis, prostatitis, epididymitis/orchitis, urethritis and STIs, urine culture interpretation, and rational antibiotic use (all 8 topics of the module in a single document).

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Practical algorithm

Content pending upload The general algorithm for the whole module (patient with urinary symptoms → localized vs. systemic UTI → management) is developed in the lesson "Rational antibiotic use" (block 5).
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Clinical case

Content pending upload Progressive presentation of the case — the student makes decisions as it unfolds.
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Self-assessment

Questions pending upload 5–10 multiple-choice questions on this lesson.
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References

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