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Blood in children's urine — visible (gross) vs microscopic, the common causes (UTI, stones, benign hematuria) and the ones that matter (glomerulonephritis, Alport), and the workup.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
Visible blood in a child's urine is alarming but often benign; microscopic blood is found incidentally and even more often harmless. The workup separates the common (UTI, stones, exercise, benign familial hematuria) from the significant (glomerulonephritis, Alport syndrome, structural disease) — and the family history and blood pressure are part of every answer.
Gross hematuria — visibly red or cola-colored urine — is a parent alarm but often benign: UTIs, stones (yes, children get them), trauma, or exercise-related. Microscopic hematuria — blood found on a dipstick or urine screen — is usually transient (viral illness, fever, exercise) and settles on repeat testing.
The reassurance math: with a normal exam, normal blood pressure, and no protein, most microscopic hematuria in children is benign familial hematuria or 'benign hematuria of childhood' — monitoring, not panic.
Blood plus PROTEIN, blood plus high blood pressure, edema, or dark urine following a sore throat or cold — that combination points to glomerulonephritis (post-streptococcal, IgA, HSP) and deserves same-day nephrology. A family history of kidney failure or hearing loss raises Alport syndrome. Clots or pain suggest stones or structural problems.
The 'red urine without blood' list: beets, berries, food coloring, and some antibiotics — a dipstick confirms whether it's truly blood before anything else.
First round: urinalysis with microscopy (dysmorphic red cells and casts suggest glomerular disease), urine culture, and blood pressure. Second round (by findings): renal ultrasound, kidney function, complement levels, and family screening.
Parents' job: collect a clean midstream sample, log the dates (the pattern matters — every day, only in the morning, after exercise), and bring the family history. With a normal workup, isolated microscopic hematuria is followed, not treated.
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