Is there a BMI limit for kidney donors?

Most centres weigh BMI as part of overall surgical and long-term risk rather than applying one universal cut-off, and thresholds differ between centres. Where weight is the only concern, some centres will re-evaluate after weight loss.

Can I donate if I smoke?

Smoking raises both surgical and long-term risk, and centres will ask you to stop before surgery. It is generally treated as something to address rather than a permanent bar.

What if my blood type does not match the person I want to help?

Paired exchange exists for exactly this. Your kidney goes to a compatible recipient, and your intended recipient receives a compatible kidney from another pair. Thousands of donors registered with MatchingDonors have indicated willingness to take part.

Does a family history of kidney disease disqualify me?

Not automatically. It is examined carefully because it affects your own long-term risk, and the outcome depends on the specific condition and how closely related that person is.

Can I donate with high blood pressure?

Uncontrolled high blood pressure is a barrier. Well-controlled blood pressure is assessed case by case, and some centres accept donors whose blood pressure is stable on treatment.

Who makes the final decision?

The transplant centre, through its own committee. Registering with MatchingDonors does not commit you and does not substitute for that medical evaluation.

Kidney Donor Requirements: Who Can Donate?

Plenty of people rule themselves out before anyone has examined them. Here is what kidney donor requirements actually are — and which common disqualifiers are myths.

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The honest answer about kidney donor requirements is that only a transplant centre can tell you whether you qualify. What follows is the general shape of it, so you know whether it is worth starting the conversation.

The general baseline

18 or older. This one is firm.
Good kidney function of your own, confirmed by blood and urine testing.
No uncontrolled diabetes and no uncontrolled high blood pressure.
No active cancer, and no infection that could transmit through a transplant.
Generally good physical and mental health, assessed as a whole rather than condition by condition.

Note the word *uncontrolled*. Well-managed conditions are assessed individually — they are not the automatic exclusions people assume.

What the evaluation actually screens for

A transplant centre is answering one question: will you still be healthy in thirty years with one kidney? To answer it they examine kidney function and anatomy, blood pressure over time, blood sugar, cardiac and general health, your family medical history and your mental readiness. They also confirm nobody is pressuring you.

The myths that stop people volunteering

"I am too old"

There is no fixed upper age limit. Centres assess health, not birthdays. People well past fifty — and past sixty — donate.

"My blood type does not match"

A blood-type mismatch used to end the conversation. Often it no longer does. Paired exchange lets your kidney go to a compatible stranger while your intended recipient receives one from another mismatched pair. Thousands of donors registered with MatchingDonors have specifically indicated they are willing to take part in paired exchanges and chains.

"I take medication"

It depends entirely on which medication and why. A well-controlled condition on stable treatment is a conversation, not a closed door.

"Someone in my family had kidney disease"

This is taken seriously, because it affects your own long-term risk — but it is assessed, not assumed. Some family histories rule donation out. Many do not.

What usually does rule donation out

Significantly reduced kidney function of your own
Uncontrolled diabetes or uncontrolled hypertension
Active cancer
Serious untreated heart or lung disease
Active substance misuse, or a mental-health crisis that makes informed consent unsafe at this time

The centre decides — not you, and not us. If you are unsure whether something disqualifies you, the useful next step is to let a transplant centre look. The worst outcome is being told no, which costs you nothing but time.

Being turned down is not a verdict on you

Centres decline potential donors regularly, and it is usually about long-term risk rather than anything you did. Many people declined at one point become eligible later — after weight loss, after blood pressure comes under control, after a condition resolves.

What happens at your first appointment

The first contact is usually a phone screening rather than a hospital visit. A living-donor coordinator asks about your age, general health, medications, and whether you have a particular person in mind. It takes perhaps twenty minutes and rules out the clearest mismatches before anyone travels anywhere.

If that goes well, blood and urine testing follows, then a fuller day of assessment. You will meet an independent donor advocate — a person whose only responsibility is you, not the recipient and not the transplant centre. Use them. They are the right person to ask the awkward questions about time off, insurance, and what happens if you change your mind.

If you clear the requirements, the next question is usually what surgery and recovery actually involve. That is covered on kidney donation risks and recovery.