The Diagnosis of Urinary Tract infection in Young children (DUTY) study

A urine test is the only reliable way to diagnose a urinary tract infection in a young child, but doctors lack clear rules for deciding which children to test and how to interpret the results. This matters because UTIs are common in children under five, but their symptoms—fever, fussiness, vomiting—overlap with many other childhood illnesses. Collecting a urine sample from a nappy-wearing child is difficult and time-consuming, so GPs need better guidance on when to bother. The current approach leads to both missed infections and unnecessary testing. The research team will build a diagnostic algorithm based on symptoms, signs, and dipstick urinalysis, then validate it in a separate group of children. They will also compare contamination rates between two common sampling methods—nappy pads and clean catch—and model the economic impact of using the algorithm versus current practice. If the algorithm works, it could reduce unnecessary urine collections and lab cultures, saving NHS resources and sparing families the hassle of repeated visits. It would also catch more real infections, preventing complications like kidney scarring. The study does not test a new treatment or device—it refines a clinical decision-making tool that quietly shapes how primary care handles a routine but consequential problem.