There are a variety of reasons why not everyone who needs an organ
can receive one, even when it is available. Pre-existing medical problems, risk of rejection, advanced age, and high cost of the procedure itself are only a few reasons that keep the dying patient waiting. However, the most common cause of the long wait is organ availability.
Ravaging diseases people encounter will certainly be fatal to many
without an organ replacement. Diabetes is one of the most severe diseases,
it virtually attacks, the entire body. Kidney failure is another, it keeps a patient on dialysis to filter out the toxins from their blood, the only way of surviving while awaiting a donor organ. Everyone on dialysis is a also a candidate.