Urinary infections in children is very common. Delay in the diagnosis may be followed by complications. Pyelonephritis is a febrile urinary infection with a renal injury. In local experience, about 30-40% of the children don't have an inflammatory syndrome or echographical abnormalities. Do they really have a renal injury ? In fact, only the scintigraphy or the Magnetic Resonance Imaging (MRI) may show these lesions, but are done only in specific cases (diagnosis of uropathy or nephropathy). Recent studies have shown that plasmatic Neutrophil Gelatinase-Associated Lipocalin (NGAL) is associated traumatic or inflammatory renal lesions. But the plasmatic NGAL cutoff is fluctuant depending on the cohorts and gold standards. The main goal is to evaluate a new methodology of dosing NGAL, (immuno-dosage turbidimetric dosage). The investigators suppose that plasmatic NGAL protein will detect renal injury, which would be confirmed by MRI. The aim of this study is to evaluate the area under the curve (AUC) of plasmatic NGAL protein with an automatised method, for the detection of renal injury. This would be confirmed by reno vesical MRI, in children over 2 years old with febrile urinary infections
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Compare plasmatic Neutrophil Gelatinase-Associated Lipocalin (NGAL) with gold standard Reno vesical Magnetic Resonance Imaging (MRI)
Timeframe: 48 hours after inclusion