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Suspected uncomplicated lower urinary tract infection — MSRA MCQ

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ModerateUrinary Tract InfectionsSuspected uncomplicated lower urinary tract infectionMSRA

A 27-year-old non-pregnant woman presents with 24 hours of mild dysuria. She has no new nocturia, cloudy urine, urgency, frequency, visible haematuria, vaginal discharge, vulval itch, pelvic pain, fever, rigors, loin pain, nausea or vomiting. She has had no UTI in the past 12 months, has not recently taken antibiotics and has no relevant medical history. She is haemodynamically stable and would prefer to avoid taking an antibiotic immediately if this is safe. A correctly obtained midstream urine dipstick is positive for leukocyte esterase but negative for nitrites and blood. What is the most appropriate management?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Send a midstream urine sample for culture and provide a back-up antibiotic prescription with safety-netting

Explanation lettering: D = shown as A · E = shown as B · A = shown as C · C = shown as D · B = shown as E

This woman has only one key UTI symptom (dysuria), so dipstick testing is used to increase diagnostic certainty. A leukocyte-positive, nitrite-negative dipstick result places UTI as equally likely as an alternative diagnosis rather than making it likely. UKHSA guidance recommends sending urine for culture in this situation. As she is non-pregnant, clinically well and has mild symptoms, an immediate or back-up antibiotic strategy can then be selected according to symptom severity and shared decision-making; her preference supports a back-up prescription with clear safety-netting. A is plausible because dysuria may represent cystitis, but immediate treatment without culture misses the recommended diagnostic step when the dipstick result is equivocal. C would be appropriate with a completely negative dipstick, which would make UTI less likely, but not with isolated leukocyturia. D is attractive because first-morning urine may improve nitrite detection, but this does not replace sending culture when UTI is as likely as another diagnosis. E is inappropriate because she has no systemic features, fever, flank pain, rigors, vomiting or sepsis indicators suggesting pyelonephritis.

Reference: Diagnosis of urinary tract infections: quick reference tools for primary care (Updated 7 July 2025) — https://www.gov.uk/government/publications/urinary-tract-infection-diagnosis/diagnosis-of-urinary-tract-infections-quick-reference-tools-for-primary-care Urinary tract infection (lower): antimicrobial prescribing (NG109), recommendations (2018) — https://www.nice.org.uk/guidance/ng109/chapter/Recommendations