On Jun 11, 9:24 pm, A Really Really Large Number
http://optn.transplant.hrsa.gov/about/transplantation/matchingProcess.asp
Donor Matching System
When transplant hospitals accept patients onto the waiting list, the
patients are registered in a centralized, national computer network
that links all donors and transplant candidates. The UNOS Organ Center
is staffed 24 hours a day throughout the year, and it assists with the
matching, sharing and transportation of organs via this computer
network.
Transplant centers, tissue typing laboratories, and OPOs are involved
in the organ sharing process. When donor organs are identified, the
procuring organization typically accesses the computerized organ
matching system, enters information about the donor organs, and runs
the match program. At times, when requested or when there is a need to
identify perfectly matched kidney donor/recipients, the matching
process is handled by Organ Center personnel at UNOS headquarters in
Richmond, Virginia.
For each organ that becomes available, the computer program generates
a list of potential recipients ranked according to objective criteria
(i.e. blood type, tissue type, size of the organ, medical urgency of
the patient, time on the waiting list, and distance between donor and
recipient). Each organ has its own specific criteria
After printing the list of potential recipients, the procurement
coordinator contacts the transplant surgeon caring for the top-ranked
patient (i.e. patient whose organ characteristics best match the donor
organ and whose time on the waiting list, urgency status, and distance
from the donor organ adhere to allocation policy) to offer the organ.
Depending on various factors, such as the donor's medical history and
the current health of the potential recipient, the transplant surgeon
determines if the organ is suitable for the patient. If the organ is
turned down, the next listed individual's transplant center is
contacted, and so on, until the organ is placed.
Once the organ is accepted for a potential recipient, transportation
arrangements are made for the surgical teams to come to the donor
hospital and surgery is scheduled. For heart, lung, or liver
transplantation, the recipient of the organ is identified prior to the
organ recovery and called into the hospital where the transplant will
occur to prepare for the surgery.