More than 170 million people in the United States are registered as organ donors, roughly half the country’s population. Despite that large number, the gap between supply and demand remains enormous: over 100,000 people sit on the national transplant waiting list at any given time, and 13 people die each day waiting for an organ that never arrives.
Registered Donors vs. Actual Donors
The 170 million figure represents people who checked “yes” on a donor registry, typically when renewing a driver’s license or state ID. But registration and actual donation are very different things. Only a small fraction of deaths each year meet the narrow medical criteria required for organ recovery. A person generally must die in a hospital, on a ventilator, with organs still receiving blood flow. That rules out the vast majority of deaths. In a typical year, fewer than 20,000 deceased individuals end up donating organs.
This is why the waiting list stays so long even though millions of people have signed up. The bottleneck isn’t willingness. It’s the rare combination of circumstances that makes donation medically possible.
How Many Transplants Happen Each Year
The U.S. surpassed 48,000 organ transplants in 2024, according to the United Network for Organ Sharing. That number has climbed steadily over the past decade, driven by better surgical techniques, broader acceptance criteria for donated organs, and growth in living donation. Still, 48,000 transplants against a waiting list of over 100,000 means demand outpaces supply by roughly two to one.
Kidneys account for the largest share of that waiting list by far, making up about 85% of people waiting. Liver, heart, and lung transplants fill most of the remaining spots.
Living Donors Fill Part of the Gap
Not all organ donation comes from deceased individuals. About 6,000 living donor transplants happen in the U.S. each year, most of them kidneys. A healthy person can donate one kidney and live a normal life with the remaining one. Living donors can also give a portion of their liver, which regenerates to near-normal size within weeks in both the donor and recipient.
Living donation has a major advantage: surgeons can schedule the procedure in advance, the organ spends less time outside the body, and outcomes tend to be better. Kidney transplants from living donors last longer on average than those from deceased donors.
Transplant Survival Rates
Modern transplant outcomes are remarkably good. National one-year survival rates show how far the field has come:
- Kidney: 97% patient survival, 95% graft survival
- Liver: 94% patient survival, 92% graft survival
- Heart: 92% patient survival
- Lung: 90% patient survival
Graft survival refers to the transplanted organ still functioning. A patient can survive even if the graft fails, particularly with kidneys, because they can return to dialysis or receive another transplant. These numbers reflect one-year outcomes. Longer-term survival varies by organ and by the recipient’s overall health, but many transplant recipients live for decades with their new organ.
Why the Shortage Persists
Surveys consistently show that the vast majority of American adults support organ donation in principle. The problem is structural. Many people who support donation never formally register. Others register but their families override the decision at the time of death, though this is becoming less common as registries gain legal standing. And the medical window for donation is so narrow that even universal registration wouldn’t eliminate the shortage entirely.
Some countries have tried to close the gap through “opt-out” systems, where every citizen is presumed to be a donor unless they specifically decline. Spain, which pioneered this approach along with a robust hospital coordination system, consistently leads the world in donation rates at roughly 40 to 50 donors per million people. The U.S. rate hovers around 40 deceased donors per million, which has improved significantly in recent years but still falls short of need.
What One Donor Can Do
A single deceased organ donor can save up to eight lives by donating the heart, lungs, liver, kidneys, pancreas, and intestines. When tissue donation is included (corneas, skin, bone, heart valves), one donor can help as many as 75 people. Age is rarely a disqualifier. Donors have ranged from newborns to people in their 90s. The determining factors are the condition of the organs at the time of death, not a number on a birth certificate.
Registration takes a few minutes through your state’s donor registry or at the DMV. Telling your family matters just as much, since they’re the ones hospital staff will speak with if the moment comes.