Most people become eligible for a kidney transplant when their kidney function drops to about 20% or less of normal, measured by a score called the glomerular filtration rate (GFR). At that level, or once you’re on dialysis, transplant centers will consider you a candidate, provided you can safely undergo major surgery and manage the lifelong medication that follows. Eligibility isn’t a single yes-or-no test. It’s a multi-step evaluation that looks at your kidney disease, your overall health, and your ability to follow a demanding post-transplant routine.
The GFR Threshold
GFR measures how well your kidneys filter waste from your blood, expressed in milliliters per minute. A healthy kidney filters around 90 to 120 mL/min. To qualify for the transplant waitlist, your GFR generally needs to be at or below 20 mL/min, which corresponds to advanced stage 4 or stage 5 chronic kidney disease. If your GFR is slightly higher, up to about 25 mL/min, you may still qualify under two conditions: your kidney function is declining rapidly (losing at least 10 mL/min per year), or you have a living donor lined up and can be transplanted before reaching dialysis.
You don’t have to be on dialysis to get on the list. In fact, receiving a transplant before ever starting dialysis, called a preemptive transplant, tends to produce better outcomes. This is far more common with living-donor transplants, where about 38% of recipients are transplanted before dialysis, compared to only 13% with deceased-donor transplants.
Conditions That Lead to Transplant
Any disease that destroys enough kidney tissue can eventually make you a transplant candidate. The most common causes in the United States are:
- Diabetes (type 1 or type 2): the leading cause of kidney failure nationwide, responsible for damage to the tiny blood vessels that filter your blood.
- High blood pressure: the second most common cause, gradually scarring kidney tissue over years.
- Autoimmune diseases: conditions like lupus or chronic glomerulonephritis, where the immune system attacks the kidneys directly.
- Polycystic kidney disease: an inherited condition that fills the kidneys with fluid-filled cysts until they can no longer function.
Less common qualifying conditions include IgA nephropathy, sickle cell kidney disease, congenital urinary tract defects, and kidney damage from certain medications or toxins. The underlying diagnosis matters less than the degree of kidney failure. If your kidneys have reached the eligibility threshold, the cause of the damage rarely disqualifies you on its own.
What Disqualifies You
Transplant centers recognize a short list of absolute disqualifiers. Active cancer is one: because transplant recipients take immune-suppressing drugs for the rest of their lives, any existing cancer could grow unchecked. Most centers require you to be cancer-free for two to five years before listing, with the exact waiting period depending on the type and stage of cancer.
Active, untreated infection is another disqualifier, since surgery and immunosuppression would make the infection far more dangerous. Severe heart or lung disease that makes you unable to tolerate a major operation will also rule you out. Active, untreated substance use disorder and uncontrolled psychiatric illness round out the list, not as moral judgments but because they directly threaten your ability to survive surgery and stick with the medication regimen afterward.
These exclusions are not always permanent. If the underlying problem is resolved (an infection treated, a cancer in remission, a substance use disorder in stable recovery), you can be reevaluated. A history of substance use that has been effectively addressed should not, on its own, disqualify you.
Age and Body Weight
There is no universal age cutoff for kidney transplantation. Older age alone is not a contraindication. That said, transplant centers set their own thresholds based on surgical risk. Many centers require patients over 70 to undergo coronary angiography, a detailed imaging test of the heart’s arteries. If significant heart disease or peripheral vascular disease turns up, the center may decide the surgical risk is too high. For candidates over 60, cardiovascular disease is the most common reason for being turned down.
Weight matters too. About 73% of U.S. transplant programs use a body mass index (BMI) cutoff of 40 at referral or waitlisting. A BMI above 40 is classified as class 3 obesity and is associated with higher complication rates during and after surgery. Some centers set stricter thresholds, while a minority will evaluate patients above 40 on a case-by-case basis. If your BMI is close to the cutoff, your transplant team will likely work with you on a weight management plan before listing.
The Evaluation Process
Getting on the transplant list involves weeks to months of testing. The goal is to make sure you’re healthy enough for surgery, unlikely to reject the new kidney immediately, and prepared for the commitment that follows.
Heart testing is the centerpiece of the medical workup, because cardiovascular complications are the most common serious problem after transplantation. Depending on your history, you may need an echocardiogram (an ultrasound of the heart), a stress test, or cardiac catheterization. Significant coronary artery disease that can’t be corrected is a contraindication. If treatable blockages are found, your team may address them first and then reassess your transplant candidacy.
You’ll also be screened for infections, including HIV, hepatitis B, and hepatitis C. Importantly, having one of these infections does not automatically disqualify you. Since the passage of the HOPE Act in 2013, HIV-positive patients can receive organs from HIV-positive donors. Similarly, organs from donors with hepatitis B or C are now routinely transplanted into recipients who already carry the same virus, and in some cases into uninfected recipients when the medical need is urgent and effective antiviral treatments are available.
Blood typing, tissue matching, and antibody screening round out the lab work. These tests determine which donor organs your body is most likely to accept and help the matching system pair you with compatible kidneys.
Psychosocial Requirements
Every transplant evaluation includes a psychosocial assessment, usually conducted by a social worker or psychologist. The team wants to understand whether you have a reliable support system for the recovery period, which involves transportation to frequent follow-up appointments, help managing a complex medication schedule, and someone who can monitor you for warning signs of rejection in the early weeks.
The national transplant network has stated that access to transplantation should not depend on demonstrating social support, recognizing that penalizing people for lacking family or community resources raises serious equity concerns. In practice, though, transplant teams still evaluate your support network and may ask you to develop a plan before listing if gaps exist. For children, the assessment automatically includes the caregivers who will be managing post-transplant care.
Compliance history also comes up. If you have a track record of missing dialysis sessions or not taking prescribed medications, the team will want to understand why and whether those barriers can be addressed. The concern is practical: after a transplant, skipping even a few days of immunosuppressive medication can trigger organ rejection.
Living Versus Deceased Donor Transplants
The medical eligibility criteria are largely the same whether you receive a kidney from a living or deceased donor. The key differences are timing and logistics. A living-donor transplant is a planned, elective procedure. Because you can schedule it, you’re more likely to be transplanted before starting dialysis, your hospital stay tends to be shorter, and recovery is generally quicker.
A deceased-donor transplant is unplanned by nature. When a matching kidney becomes available, you need to be ready to go to the hospital on short notice, sometimes within hours. This means your medical clearance has to stay current while you wait, and your transplant team will periodically recheck your heart health and infection status.
Having a living donor also matters at the margins of eligibility. If your GFR is between 20 and 25 and declining, some centers will list you specifically because a living donor allows the transplant to happen quickly, before your kidney function deteriorates further.
How Waitlist Time Accrues
For deceased-donor transplants, your position on the national waitlist depends partly on how long you’ve been listed. Wait time begins accruing when your GFR first drops to 20 mL/min or below, or when you start dialysis, whichever comes first. This is a significant detail: you can begin accumulating wait time before you’re formally placed on a center’s list, as long as you meet the GFR criteria.
A recent policy change addresses a historical inequity. Older GFR formulas included a race-based adjustment that made Black patients appear to have better kidney function than they actually did, delaying their eligibility. Since January 2024, transplant programs are required to review all currently listed Black candidates and submit corrections so those patients receive credit for the wait time they should have been accruing under a race-neutral formula. If you’re a Black patient already on the list, your transplant center should have assessed whether your wait time start date needs to be moved earlier.