Table 3.

Indications for kidney biopsy

At onset
Age of onset <1 year.
Gross hematuria, persistent microscopic hematuria or low serum C3.
Sustained hypertension.
Renal failure not attributable to hypovolemia.
Suspected secondary causes of nephrotic syndrome.
After initial treatment
Proteinuria persisting despite 4-weeks of daily corticosteroid therapy.
Before treatment with cyclosporin A or tacrolimus.