the approximate incidence of the different bleeding complications was as follows:
●Transient macroscopic hematuria (3.5 percent)
●Requirement for erythrocyte transfusion (0.9 percent)
●Requirement for angiographic intervention to control bleeding (0.6 percent)
●Requirement for nephrectomy to control bleeding (0.01 percent)
●Death (0.02 percent)
The rate of requiring erythrocyte transfusion, which was 0.9 percent overall, was on average significantly higher in patients with the following characteristics
●Systolic blood pressure greater than or equal to 130 mmHg (1.4 versus 0.1 percent)
●Serum creatinine greater than or equal to 2 mg/dL (177 micromol/L) (2.1 versus 0.4 percent)
●Hemoglobin concentration less than 12 g/dL (2.6 versus 0.5 percent)
●Age over 40 years (1 versus 0.2 percent)
Ref:
Bleeding complications of native kidney biopsy: a systematic review and meta-analysis. Corapi KM, Chen JL, Balk EM, Gordon CE
Am J Kidney Dis. 2012 Jul;60(1):62-73. Epub 2012 Apr 24.
and UpToDate