Renal biopsy should be considered in all causes of intrinsic ARF, especially in the estimated 10 to 25 percent of patients with ARF that cannot be diagnosed clinically.22 Retrospective studies have shown that the results of the renal biopsy significantly change the diagnosis and management of ARF in 40 percent of cases. 23 The most common complication of renal biopsy is hematuria, which occurs in almost all patients. Serious complications defined as the need for blood transfusion, nephrectomy, puncture of other organs, or perinephric hematoma occur at a rate of 2.1 percent. Overall mortality for renal biopsy is 0.1 percent.
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