How to diagnose Henoch - Schonlein purpura nephritis?

Henoch - Schonlein Purpura Nephritis the diagnosis is mainly based on hemorrhagic skin rashes and kidney damage. Help the typical skin rash disease diagnosis, Sparse skin rash or any symptoms of kidney rashes have dissipated should ask detailed history (including joints, Gastrointestinal symptoms) and rashes form. Right kidney typical symptoms, such as edema, hypertension, hematuria, proteinuria, nephrotic syndrome and renal insufficiency. Diagnosis more easily; Urine for minor changes, general domestic protein in urine qualitative (+) and urine RBC over 5 / high-power microscope, or 2 ~ 3 / high-power microscope as a diagnostic criteria. Acute capillary fragility test positive, and platelet counts and function tests normal, the diagnosis of the disease are meaningful. Renal biopsy to diagnose the disease and contribute to the understanding of disease and assessing prognosis. Skin biopsy help with IgA nephropathy outside the differential nephritis. 