Pediatric UTI
A urinary tract infection in a child is a red flag, not just an infection — a febrile (upper-tract) UTI may signal an underlying anomaly (reflux, obstruction) and risk renal scarring, so it is treated promptly and investigated ultrasound-first by age and severity.
The big picture
UTI is common in children and important because a febrile UTI usually means pyelonephritis, which can scar the developing kidney, and because UTIs may be the presenting sign of an underlying anomaly such as vesicoureteric reflux (VUR) or obstruction. Diagnosis requires a properly collected urine sample (the method matters in non-toilet-trained children), since contamination is common.
Treat a childhood UTI promptly and treat it as a possible marker of an anomaly — confirm on a clean sample, classify febrile vs lower, investigate ultrasound-first by age/severity, and fix bladder/bowel dysfunction.
Symptom sorter
Severity guides everything.
Diagnostic algorithm
Each step answers one question. Tap to expand.
Treatment ladder
Treat promptly (more urgently if febrile), investigate by age and severity to find anomalies/scarring, and correct modifiable factors.
Complications
- Renal scarring (reflux nephropathy), hypertension, impaired renal growth
- Urosepsis
- Antibiotic resistance/side effects
- Over-investigation/radiation if not targeted
- Prompt treatment, treat bladder/bowel dysfunction, targeted investigation
- Treat anomaly/scarring risk; monitor BP/function
Follow-up
- Recurrence of UTIs
- Renal scarring/growth and blood pressure
- Bladder/bowel function
- Age-appropriate follow-up; imaging surveillance if anomaly/scarring
- No recurrence, no new scarring, normal growth/BP
- Recurrent febrile UTIs, new scarring, undiagnosed anomaly
- Recurrent/atypical infections; per anomaly pathway
- Renal scarring, hypertension, impaired renal growth if recurrent upper-tract UTIs missed
Memory hooks
Childhood UTI = possible anomaly marker.
Febrile = upper tract = scarring risk.
Clean sample before you treat/label.
Ultrasound-first; VCUG/DMSA selectively.
Always treat constipation/bladder-bowel dysfunction.
Board traps
Febrile UTI → pyelonephritis/scarring risk, investigate.
Recurrent UTIs → look for reflux/obstruction and treat constipation.
Male infant UTI with poor stream → consider PUV.
Clinical cases
A 10-month-old presents with a high fever and is found to have a confirmed E. coli urinary tract infection on a properly collected sample.
How should this be approached?