Test Details: The test quantifies the risk of transplant rejection and indicates sensitization status of the recipient. High panel reactive antibody (PRA) values increases the risk of rejection resulting in higher immunosuppressant requirement and shorter transplant survival. PRA testing helps in determination of patients waiting for cadaveric transplants. The PRA score is expressed as a percentage, which can range from 0 to 99 percent, that represents the likelihood of exsisting antibodies.