Recurrent urinary tract infection (UTI) in children (birth to 16 years)
Recurrent UTI in children is clinically important because repeated upper‑tract infection can cause renal parenchymal damage, hypertension and long‑term renal impairment. UK guidance (NICE NG224) provides standardised definitions, investigation pathways and referral triggers. Emergency clinicians must:
- obtain an appropriate urine specimen for culture before starting antibiotics where this will not delay urgent treatment;
- recognise which children require imaging or specialist referral; and
- treat the acute episode while preserving options for further investigation.
Definition (NICE NG224) Recurrent UTI in children (birth to 16 years) is any one of:
- two or more episodes of UTI with acute pyelonephritis/upper UTI;
- one episode of pyelonephritis/upper UTI plus one or more episodes of cystitis/lower UTI; or
- three or more episodes of cystitis/lower UTI.
Note: asymptomatic bacteriuria is common and expected in children with indwelling catheters and should not be treated as recurrent UTI without clinical signs. UTIs in boys-particularly infants and young children-are more likely to reflect underlying anatomical abnormality and often prompt earlier investigation.
Clinical presentation
- Infants and young children: fever without an obvious source, poor feeding, vomiting, irritability or lethargy; any febrile infant without another focus should have urine obtained for culture.
- Older children: dysuria, frequency, urgency, abdominal or loin pain and fever.