Over 20,000 people get transplants in the U.S. every year. They
are a standard, successful treatment for many diseases and
conditions. Over half of all organ transplants done in the U.S.
are kidney transplants, about a quarter are liver transplants, with the other organs making up the remaining numbers.

The number of transplants is severely limited, however, by the number of donations that occur --- and another person is added to the waiting list every 22 minutes.