To the Editor.— Drs. Immergut and Plotkin (211:827, 1970) are to be commended for their courage and candor in reporting their renal biopsy complication. I agree with their conclusion that renal arteriography should be done promptly when faced with postbiopsy bleeding. However, I must take issue with their statement that renal biopsy under fluoroscopic visualization after infusion pyelography is a "blind" procedure. The advantage of the fluoroscopic pyelographic technique is that the biopsy needle may be easily guided to a point just within the lateral margin of the lower pole of the kidney. This extra precaution avoids large blood vessels and calyces and minimizes the possibility of trauma to the vascular supply or collecting system. Reference to Fig 2 in the report illustrates this last point. The kidney is well outlined by dye but the site of biopsy is almost closer to the hilus than to the peripheral margin,