In a febrile infant or young child in whom UTI is suspected and antibiotics are about to start, the urine sample must come first. Once antibiotics are given, a culture can be falsely negative and the diagnosis may never be confirmed, which affects decisions about imaging and future episodes.
Bag samples are acceptable for a screening dipstick but are frequently contaminated, so a positive bag result should be confirmed with a catheter or suprapubic sample before treatment where possible. A clean-catch sample is a reasonable alternative in a child who is not unwell.
- Collect urine before the first antibiotic dose whenever the child's condition allows.
- Confirm a positive bag specimen with a catheter, suprapubic or clean-catch sample before treating.
- Send every sample for culture, not only dipstick.
- Record how the sample was collected; it affects how the result is read.
Why it matters
An unconfirmed UTI leaves every later imaging and recurrence decision uncertain.
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