Why is a transplanted kidney located in the lower part of the abdomen?

R or L lower quad: The old kidneys are not removed and the transplant is usually placed in right or left lower quadrant in the abdomen. For the transplanted kidney to function it needs to have an artery and a vein for blood supply. The renal artery and vein are usually connected to the recipient's external iliac artery and vein. The urine needs to be transpported via ureter to the recipients's bladder.