Three matching tests, blood typing, tissue typing and cross-matching, are needed before kidney transplantation. 1. Blood typing test means that the ABO blood type of the kidney transplant recipient and the kidney donor need to match. As a special case the kidney donor’s blood type is O and the blood type of the person who needs a kidney transplant is other blood types, the kidney donor can be used as an alternative.2. After the blood typing test is completed, tissue typing of the kidney donor and the recipient is needed, which mainly detects the number of antigens shared by the donor and the recipient, which can identify the differences between the body tissues of the two people. Parents and children are at least a 50 percent match, and siblings are a zero to 100 percent match. The best match for a recipient is when all six antigens match each other.3. A crossmatch test is required, where the recipient will be given at least two different times to see if there will be a reaction to the donor kidney. If there is no reaction, the result is a negative crossmatch, indicating that the transplant can proceed. These three tests are essential matching tests during the transplant matching process.