Core Biopsy Technique

Kidney - Tru-cut Biopsy TechniqueKidney - Tru-cut Biopsy TechniqueTo obtain a core biopsy sample, a 14, 16 or 18 gauge Tru-cut biopsy needle is used. The needle is placed against the renal capsule at the caudal pole of the kidney. The instrument is positioned to obtain mostly a cortical sample; do not aim the needle towards the renal pelvis or renal vessels. The instrument is activated and once retracted, the surgeon or assistant places a finger on the puncture site for several minutes to control hemorrhage until clotting occurs. A suture is rarely required in patients with normal clotting function. The biopsy core can then be removed from the instrument and placed in formalin for histopathology.