'Idiopathic' Hematuria

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Abstract
• Evaluation of the patient with isolated hematuria is often problematic. Sixty-five patients with this entity were studied prospectively with renal biopsy; serum IgA levels, skin biopsy for IgA immunofluorescence, and HLA typing were also studied in most patients. Previously, all patients had had a noncontributory history and physical examination, normal results of structural evaluation, serologic and clotting studies, and proteinuria of less than 1000 mg/d (Arch Intern Med 1987;147:434-437)