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1 Immunological tests: A blood sample is taken for the following tests: 2  Blood type. The blood type (A, B, AB, or O) must be compatible between the donor and recipient. Blood type requirements of the kidney donor are the most important matching factor.  Human leukocyte antigens (HLAs).
The catheter is pushed forward over the wire and into the aorta (the main blood vessel leading from the heart) and then into the kidney artery. The test uses a special dye (called contrast) to help the arteries show up on the x-ray. The blood vessels of the kidneys cannot be seen with ordinary x-rays. The dye flows through the catheter into the kidney artery. X-ray images are taken as the dye moves through the blood vessels.