Figure 4.

Composite proportion was 0.9% (95% confidence interval, 0.5% to 1.4%). Forest plot of studies assessing for blood transfusion requirement after ultrasound-assisted percutaneous kidney biopsy. Pooled percentage requiring blood transfusion is displayed. In the subanalysis, the risk for blood transfusion in native kidney biopsies was 0.6% (95% confidence interval, 0.2% to 2.4%; P=0.60), and the risk for blood transfusion in transplant kidney biopsies was 0.8% (95% confidence interval, 0.4% to 1.6%; P=0.70); these were not statistically different from the composite proportion.