What Are the Risks of Living Kidney Donation?

Living kidney donation is one of the safest major surgeries a healthy person can undergo, with a perioperative death rate of roughly 3 in 10,000, but “safe” does not mean “risk-free.” Donors face a real set of short-term surgical risks, a small but measurable increase in long-term kidney failure, and a handful of less obvious consequences ranging from chronic pain to insurance headaches. The picture is reassuring overall, yet the details matter, and they vary considerably depending on who you are.

What Happens During and Right After Surgery

The operation itself, called a donor nephrectomy, is almost always performed laparoscopically today. A large review of the evidence puts the overall perioperative complication rate at about 17%, though the vast majority of those complications are minor. Serious complications requiring a procedure or intensive care occur in roughly 2–3% of donors, and the most common problems are gastrointestinal issues, bleeding, and respiratory trouble.¹ A New Zealand study tracking over 1,300 donors found that about 22% reported some kind of complication, but only 5% needed an intervention beyond routine care, and no donors died in the first three months.² Perioperative mortality, while not zero, is extremely rare at about 0.03%.¹

Laparoscopic surgery has largely replaced open surgery for kidney donation, and a Cochrane review confirms it leads to less pain medication use and shorter hospital stays, though the procedure takes longer and warm ischemia time (the period the kidney goes without blood flow) is slightly extended.³ Robotic-assisted surgery is a newer option that appears to reduce hospital stays and postoperative pain compared with standard laparoscopy, though complication rates are similar between the two.⁴

Chronic Pain Is More Common Than Many Donors Expect

One risk that often gets glossed over in pre-donation conversations is chronic postsurgical pain. A study of donors who had hand-assisted laparoscopic nephrectomy found that about a quarter still had some degree of pain at a median of 19 months after surgery, and roughly a third reported pain when asked to rate it on a visual scale. Complaints typically occurred during bending or exercise, and about 10% of donors needed painkillers during the follow-up period.⁵ Predictors for developing chronic pain include severe pain in the early days after surgery, a history of previous abdominal operations, and pre-existing pain conditions.⁶ For most affected donors the pain is mild and manageable, but it is worth discussing honestly beforehand, especially with people who already have chronic pain issues.

How the Remaining Kidney Compensates

After one kidney is removed, the remaining kidney does not simply do half the work. It undergoes compensatory hypertrophy, physically growing and filtering more to pick up the slack. In a Korean study, about 86% of donors showed measurable growth in their remaining kidney.⁷ Kidney function, measured by estimated filtration rate, drops immediately after surgery from a typical pre-donation level of around 100–110 down to roughly 65, then gradually recovers. One study found the remaining kidney’s filtration capacity improved by about 2% per year after surgery.⁸ At one year, the median filtration rate in a separate study had recovered to about 87, roughly 80% of the original two-kidney capacity.⁷

This recovery is impressive, but the new baseline is still lower than what a two-kidney person walks around with. That permanent reduction in reserve is the biological reason donors carry a somewhat higher long-term risk of kidney problems, even if the remaining kidney functions well for decades.

The Long-Term Risk of Kidney Failure

This is the question prospective donors worry about most, and the data here are reassuring but not without nuance. A large U.S. study estimated that 15 years after donation, about 31 out of every 10,000 donors had developed kidney failure, compared with roughly 4 out of 10,000 among carefully matched healthy people who did not donate.⁹ In absolute terms that is still a small number, and the estimated lifetime risk of kidney failure was 90 per 10,000 donors, compared with 326 per 10,000 in the general (unscreened) population. That last comparison reflects the fact that donors are cherry-picked to be healthy, which makes them far less likely to develop kidney failure than the average person on the street, even after giving up a kidney.

A Norwegian study struck a more cautionary note, finding a hazard ratio for kidney failure of about 11 in donors compared with eligible non-donor controls, along with modestly elevated risks of cardiovascular death and overall death.¹⁰ That hazard ratio sounds alarming, but a high relative risk on top of a very low baseline still translates to a low absolute risk. The Norwegian study has also been critiqued for methodological issues including a younger and healthier control group.¹¹ A systematic review and meta-analysis of mid- and long-term outcomes found no evidence of higher all-cause mortality, cardiovascular disease, hypertension, or diabetes in donors relative to non-donor populations.¹²

The honest summary: researchers have gone back and forth on this for years, and the disagreement is partly about who counts as a fair comparison group. Against the general population, donors actually live longer, but that is because they were healthier than average to begin with. Against equivalently healthy non-donors, any added mortality risk from donation appears to be very small, and not all studies find one at all.

Blood Pressure, Protein in the Urine, and Metabolic Changes

A recent U.S. study following donors for a median of about 7 years found that hypertension developed in 17% of donors and 17% of matched non-donors, meaning no meaningful difference.¹³ That same study found a slight trend toward more albumin in the urine among donors, but the difference was not statistically significant. A Swiss study found a more pronounced short-term effect: donation increased the risk of hypertension sharply in the first year, but donors who stayed normotensive at 12 months returned to a risk level similar to the general healthy population.¹⁴ For donors who do develop hypertension after donation, elevated blood pressure becomes the main driver of protein leaking into the urine, which in turn signals kidney stress.

Metabolic changes beyond blood pressure deserve mention. In a Swiss registry analysis, about 6% of donors developed hypertension during a median follow-up of about 3 years, 2.6% developed cardiovascular disease, and 1.1% developed type 2 diabetes. Donors who were obese at the time of donation had a significantly higher rate of post-donation diabetes.¹⁵ An Israeli study found that donors had higher increases in BMI, triglycerides, diabetes, and metabolic syndrome compared with controls over five years.¹⁶ Whether donation itself causes these metabolic shifts or whether they simply reflect natural aging in people who were already on that trajectory remains an open question.

Who Faces Higher Risk

Not all donors carry the same risk profile. A study of nearly 134,000 U.S. donors found that Black donors, male donors, those with higher body mass, and those biologically related to the recipient all had elevated odds of developing kidney failure after donation. Being Black roughly tripled the risk, being male roughly doubled it, and every 5-unit increase in BMI raised the risk by about 60%.¹⁷ The JAMA study described earlier bore this out: the 15-year rate of kidney failure was about 75 per 10,000 among Black donors compared with about 23 per 10,000 among white donors.⁹

Part of this disparity traces to genetics. Roughly 13% of African Americans carry two high-risk variants of the APOL1 gene, and up to 20% of those individuals develop serious kidney disease. For young Black male donors carrying two APOL1 risk variants, the projected 25-year risk of chronic kidney disease has been estimated at about 10%, roughly 10 times higher than for Black men without those variants and 20 times higher than for young white men.¹⁸ Current guidelines recommend offering APOL1 genotyping to donor candidates of African ancestry, though how to act on the results is still debated.¹⁹

Donor evaluation guidelines continue to evolve in other ways. In 2025, North American guidelines lowered the blood pressure threshold for diagnosing hypertension from 140/90 to 130/80, which will lead some potential donors to be declined or asked to bring their blood pressure down before being approved.¹⁹ Kidney function cutoffs also play a role: current international guidelines use filtration rate thresholds to determine eligibility, with anyone below 60 excluded and anyone above 90 generally accepted.²⁰

Pregnancy After Donation

Women who donate a kidney and later become pregnant face a higher chance of developing gestational hypertension or preeclampsia. A study comparing donors to non-donors found the rate of gestational hypertension or preeclampsia was 11% in donors versus 5% in non-donors, roughly doubling the odds.²¹ A Korean study found a similar pattern, with donor pregnancies showing preeclampsia rates of about 9% compared with under 2% for controls.²²

Context matters here. Before donation, women accepted as donors are healthier than average and have preeclampsia rates lower than the general population. After donation, their risk rises to roughly what you would see in an average pregnancy, which is still relatively low. A systematic review concluded that the absolute risk of preeclampsia went from about 1–3% before donation to about 4–10% after, and that fetal outcomes like preterm birth and low birth weight were not significantly different.²³ The Korean study added that donating within five years of delivery and having a first pregnancy were risk factors for preeclampsia in donors.²² No maternal or fetal deaths were reported in any of the studies, and the large majority of post-donation pregnancies were uncomplicated.

Emotional and Psychological Effects

The psychological picture is overwhelmingly positive. Systematic reviews consistently find that quality of life scores after donation either hold steady or slightly improve compared with before, and the vast majority of donors do not regret their decision.²⁴ In a large single-center survey, only about 2% of donors reported regret, and rates of anxiety (about 6%) and depression (about 4%) were in line with or lower than general-population figures.²⁵

That said, a minority of donors do struggle. Reported depression rates across studies range widely, from 0% to nearly 47% depending on how symptoms are measured and when.²⁶ The biggest psychological risk factor is what happens to the recipient. Donors whose recipients experienced graft loss were more than five times as likely to screen positive for depression and significantly more likely to report regret.²⁵ Other risk factors include postoperative complications, lack of social support, donor fatigue, and the nature of the donor-recipient relationship.²⁴

People who donate to strangers — so-called nondirected or altruistic donors — appear to fare just as well psychologically as those who donate to someone they know. A UK prospective study found no differences in regret, psychosocial outcomes, or physical outcomes between the two groups.²⁷ In a separate long-term survey of 77 nondirected donors at a single center, only one expressed regret, and the most common stressor was worry about whether the recipient’s body would reject the kidney.²⁸

Financial and Insurance Hurdles

The risks of kidney donation are not only medical. Although the recipient’s insurance typically covers the surgery itself, donors often absorb indirect costs like lost wages, travel, and follow-up care expenses. A consensus conference noted that the economic climate has been associated with declines in living donation rates and that some donors face nontrivial financial fallout, prompting recommendations for standardized wage reimbursement and employment protections.²⁹

Insurance is a particular sore spot. In one U.S. single-center survey, 7% of donors who sought new health insurance after donation reported problems, with some denied outright or charged higher premiums because of their donor status. The picture was worse for life insurance: a quarter of donors who applied reported difficulty, with many denied or told donation counted as a pre-existing condition.³⁰ Legislation to protect donors from insurance discrimination exists in some countries and U.S. states but is not universal. Globally, reimbursement programs for lost income and incidental costs exist in about 21 countries, and 10 of those have comprehensive programs covering all major cost categories.³¹

Bone Health After Donation

Because the kidneys play a central role in regulating calcium, phosphorus, and vitamin D, researchers have looked at whether losing a kidney affects bone health. In the short term, bone mineral density does not appear to change: one study found no difference in density at the spine, hip, or femoral neck 12 months after donation.³² But a longer-term study comparing donors more than 20 years out from surgery to matched controls found that donors had persistently lower levels of active vitamin D and higher levels of parathyroid hormone, along with elevated bone turnover markers. Bone density was still similar between donors and controls, though high-resolution imaging hinted at thinner cortical bone and lower bone strength in donors. The researchers speculated that these cumulative hormonal changes could explain why some data suggest modestly higher vertebral fracture rates in older donors.³³ This area of the science is still emerging, and the clinical significance is unclear, but it suggests that long-term donors might benefit from periodic bone health monitoring.

The Follow-Up Gap

Perhaps the most underappreciated risk of living kidney donation is the lack of follow-up care many donors experience. In the United States, transplant programs are required to report donor data at 6, 12, and 24 months after donation. Yet fewer than half of programs are able to meet these reporting requirements.³⁴ Donors face geographic, financial, and logistical barriers to returning for visits, and many are lost to follow-up within months.³⁵ Follow-up visits may also create out-of-pocket costs for donors, compounding the financial issues described earlier.³⁶

This matters because many of the risks covered in this article, including rising blood pressure, proteinuria, and metabolic changes, are detectable and treatable if caught. A donor who drops out of follow-up loses that safety net. Telemedicine has been proposed as one solution for making follow-up less burdensome, and some centers are beginning to experiment with it. Until the system improves, donors should be proactive about scheduling kidney function checks with their primary care providers, even years after the surgery, and especially if they develop high blood pressure or gain significant weight.

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