Cytokine Kinetics Test to Assess the Presence or Absence of Tolerance in Organ Transplant

The purpose of this pilot study is to determine if there is clinical correlation between the CKT and transplant recipients who are known to be on minimal or no immunosuppression (presumed tolerant) and those who are on conventional amounts of immunosuppression and have either experienced rejection (presumed hyper-responsive to donor) or have not experienced rejection (unknown responsive state).