Postinfectious nephritis streptococcal or other causes

Low C3.

2. IgA nephropathy. Normal C3; occurs with viral upper respiratory infection.

3. Henoch-Schonlein nephritis. Systemic findings include rash, abdominal pain, and joint problems.

4. Chronic nephritis. Focal segmental, membranous, or membranoproliferative disease usually causes significant proteinuria.

5. Lupus nephritis. Low C3; other systems may be affected.

6. Vasculitis. Scleroderma, Wegener granulomatosis, or pol-yarteritis nodosa.

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