Organ donation is a multi-step process that begins with either a living person volunteering to donate or a deceased patient being identified as a potential donor in a hospital. More than 48,000 transplants were performed in the United States in 2024, yet over 103,000 people remain on the national waiting list, and 13 people die each day waiting. Understanding how donation actually works, from the initial identification of a donor to the moment an organ reaches its recipient, helps explain both why the system exists and why the gap between supply and need persists.
How Deceased Donors Are Identified
Most transplanted organs come from people who die in a hospital, typically from a traumatic brain injury, stroke, or a condition that cuts off oxygen to the brain. These events are known as “trigger events” because they are the clinical situations most likely to lead to brain death. When one occurs, hospital staff are required to notify their regional organ procurement organization (OPO), the nonprofit agency responsible for coordinating donation in that area.
An OPO coordinator is then dispatched to the hospital. Their role is broad: they screen the patient for medical suitability, work with the bedside team to discuss family needs and clinical care, coordinate with the family, and manage the physiological needs of the potential donor. Through frequent team huddles, the coordinator and hospital staff develop a plan that addresses both the family’s emotional needs and the medical steps required to keep organs viable.
Two Ways Death Is Determined
A person must be legally dead before any vital organs are removed. Under the Uniform Determination of Death Act, adopted in every U.S. state, death can be determined in two ways: irreversible cessation of all brain function (including the brainstem), or irreversible cessation of circulatory and respiratory function. There is only one kind of death, but these are two legally recognized paths to confirming it.
In brain death donation, the patient has no brain activity whatsoever, even though a ventilator may still be circulating oxygen through the body. This is the more common pathway and typically yields more transplantable organs because blood flow to the organs is maintained until recovery surgery.
In donation after circulatory death (DCD), the family has decided to withdraw life support for a patient who is not brain dead but has no chance of meaningful recovery. After life support is removed, physicians wait for the heart to stop on its own, which can take anywhere from a few minutes to about an hour. Once circulation ceases, the doctor observes the patient for 2 to 5 minutes to confirm the heart will not restart spontaneously, then pronounces death. Only after that pronouncement can organ recovery begin.
Legal Authorization and the Donor’s Wishes
The foundational legal principle is simple: the donor’s wishes come first. If you registered as an organ donor during your lifetime, whether through a state registry, your driver’s license, or another legal document, that decision is considered an irrevocable anatomical gift under the Uniform Anatomical Gift Act. It does not require the consent of anyone else after your death.
In practice, OPO coordinators still speak with families, both to inform them and to gather medical history. But legally, a registered donor’s decision stands. If the deceased person never registered a preference, the next of kin is asked to authorize donation. The legal hierarchy typically follows spouse, adult children, parents, and then other relatives. Some states allow a person to revoke their donor status verbally. Florida, for example, allows someone to change or revoke their donation plans by telling at least two people, one of whom cannot be a relative.
Keeping Organs Viable After Death
Brain death triggers a cascade of physiological disruptions: blood pressure swings, hormone imbalances, inflammation, and fluid shifts that can damage transplantable organs within hours. The ICU team and OPO coordinator work together to counteract these changes, restoring blood volume, correcting electrolyte imbalances, and maintaining adequate blood pressure and oxygen delivery to the organs. Hormonal therapies may be used to replace functions the brain can no longer regulate, and careful temperature management helps preserve organ quality.
This phase is a race against biology. Once an organ is removed from a donor and cooled for transport, it has a limited window of viability. Hearts must be transplanted within roughly 4 hours. Lungs have about a 6-hour window. Kidneys are more resilient and can tolerate longer cold storage, but outcomes worsen with every additional hour. These tight timelines are why donor and recipient surgeries must be coordinated almost simultaneously, sometimes across hundreds of miles.
How Organs Are Matched to Recipients
Once a donor is confirmed and organs are deemed medically suitable, the OPO reports detailed medical and genetic information to the national matching system run by the United Network for Organ Sharing (UNOS). A computerized algorithm then generates a ranked list of potential recipients for each available organ.
The matching criteria vary by organ but generally include:
- Blood type and organ size compatibility
- Medical urgency of the recipient
- Time spent on the waiting list
- Geographic distance between the donor hospital and the recipient’s transplant center
- Immune system compatibility between donor and recipient
- Age considerations, including whether the recipient is a child
Transplant centers at the top of the list are contacted in order. The recipient’s surgeon evaluates whether the organ is a good fit for their specific patient. If they decline, the next center on the list is contacted. This process can happen rapidly, especially for time-sensitive organs like hearts and lungs.
Living Donation: A Separate Path
Living donation follows a completely different process. A healthy person, often a family member or close friend but sometimes a stranger, volunteers to donate a kidney or a portion of their liver. Because the donor is alive and healthy, the evaluation is extensive and designed primarily to protect them.
The team involved in evaluating a living donor is large: a surgeon, medical specialists, a transplant coordinator, a social worker, a dietitian, a psychologist or psychiatrist, a financial analyst, and an independent living donor advocate (ILDA). The medical evaluation assesses immune compatibility with the recipient, the donor’s overall health, surgical risk, organ anatomy and function, and whether the donor carries any transmissible diseases.
A separate psychosocial evaluation happens face to face. Its purpose is to assess the donor’s capacity to make an informed decision, screen for signs of coercion or financial pressure, and identify any risk factors for poor psychological outcomes after surgery. The independent donor advocate is specifically tasked with looking out for the donor’s interests alone, separate from the recipient’s transplant team. This advocate contacts the donor at least twice: once during the initial evaluation and again after the donor has learned the full scope of medical, psychological, and financial risks.
For living kidney donors, the surgery itself is typically done laparoscopically. Hospital stays average one to two days. Most donors return to work within two to four weeks, though it can take three to four months to feel fully back to normal.
Who Pays for Donation
The donor’s family does not pay for organ donation. All costs related to organ recovery, preservation, and transport are covered by the recipient’s insurance or the organ procurement organization. The donor’s medical care up to the point of death is billed normally, but everything related to the donation process itself is separate. For living donors, the recipient’s insurance typically covers the donor’s surgery and immediate medical care, though living donors may still face indirect costs like lost wages during recovery.
The U.S. system is built on the principle of voluntary, altruistic donation. Federal law prohibits giving “valuable consideration” to organ donors, which most legal experts interpret as barring significant financial benefits to donors or their families. There has been ongoing debate about whether modest benefits, like funeral expense offsets, could be offered without violating this principle, but no such system is currently in place.
What a Single Donor Can Provide
A single deceased donor can save up to 8 lives through organ transplantation and enhance over 75 more through tissue donation. The organs most commonly transplanted are kidneys, livers, hearts, lungs, pancreases, and intestines. Tissue donations, which include corneas, skin, bone, heart valves, and tendons, follow a different recovery process and have much longer preservation windows, meaning they don’t face the same time pressure as solid organs.