Composite proportion was 0.7% (95% confidence interval, 0.4% to 1.1%). Forest plot of studies assessing for additional intervention after ultrasound-assisted percutaneous kidney biopsy. Pooled percentage requiring additional intervention displayed. In the subanalysis, the risk for additional intervention in native kidney biopsies was 1.2% (95% confidence interval, 0.4% to 3.8%; P=0.50), and the risk for additional intervention in transplant kidney biopsies was 0.5% (95% confidence interval, 0.2% to 1.1%; P=0.60); these were not statistically different from the composite proportion.