The most needed organ in the human body that is needed for transplant the most is the Kidneys.
Kidneys are the most common transplanted organ in humans.
There are a lot of people that are on dialysis due to kidney failure and are awaiting a kidney donation for kidney transplantation.
Some people who have kidney disease may be on the waiting list for a donated kidney and a kidney transplant for up to 5 years and some may need to wait 10 years.
During that time while they are waiting for a kidney transplant they can be on dialysis to keep their kidneys clean.
Some people have lived on dialysis for as long as 25 years and some only live 5 to 10 years.