Hematologist
CION Cancer Clinics
Can I be a stem cell donor? Age, weight and health checks | CION Cancer Clinics
Most healthy adults who are not seriously overweight and have no major long-term illness can donate stem cells. Registries set firm limits on age, weight and health at sign-up. A matched brother, sister or parent is judged more individually, so they may still be accepted outside those limits. A medical check on you always makes the final call. This page explains what is checked and why. At CION Cancer Clinics, our haematology team assesses whether a transplant or CAR-T fits your situation and coordinates care with qualified centres.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Who can be a stem cell donor?
- How do the rules differ for family and registry donors?
- Which health problems usually affect whether you can donate?
- How is your eligibility actually checked?
- What do people wrongly assume rules them out?
- What happens if you are told you cannot donate?
- Common questions about donor eligibility
The short answer
Who can be a stem cell donor?
Most healthy adults who are not seriously overweight and have no major long-term illness can donate. The exact rules depend on whether you are donating for a relative or joining an unrelated donor registry, and the final word always comes from a medical check done on you.
Two different sets of rules
Registries set firm limits on age, weight and health before you can even sign up, because they want donors who will stay suitable for many years. A brother, sister or parent who matches a patient is judged more individually. Doctors weigh the need for your cells against the risk to you, so a relative outside registry limits may still be accepted.
Why the checks matter to you
Eligibility rules protect you first. Donation involves either injections and a blood collection machine, or a marrow collection under anaesthesia. Some health problems make those riskier for the donor. Other rules protect the patient, whose defences will be very low after the transplant.
The type of donation changes the rules too
Giving cells from the blood means several days of injections and a few hours on a collection machine, so the team looks closely at your veins and blood counts. Giving marrow from the hip bone means a general anaesthetic, so your heart, lungs, weight and any past reaction to anaesthesia matter more. A problem that rules out one method may still allow the other.
What this page cannot decide
No list can tell you whether you personally can donate. Treat what follows as a guide to the questions you will be asked, not as a yes or no.
Answer every health question honestly. Hiding a condition can put you or the patient at risk.Not sure whether this applies to you?
Ask an oncologistHealth conditions
Which health problems usually affect whether you can donate?
These are common reasons for a closer look. Some rule you out. Many do not.
Usually rule you out
Conditions that make donation unsafe for you, or that could pass to the patient through the cells.
- HIV, hepatitis B or hepatitis C
- Most past or current cancers
- Serious heart or lung disease
- Bleeding or clotting disorders
Need a doctor's review
Many donors with these are accepted, depending on how well controlled they are and the type of donation.
- High blood pressure or diabetes
- Asthma or back problems
- Autoimmune conditions
- A blood disorder trait
Usually a pause, not a no
These delay donation until they have passed or settled.
- Pregnancy and the time after birth
- A recent infection or fever
- A recent tattoo or piercing
- Recent malaria or dengue
Weight and body size
Being very overweight raises anaesthesia risk and can make veins harder to use. Being very underweight can also be a concern. The team looks at your overall health, not only the scale.
The check-up
How is your eligibility actually checked?
Health questionnaire
You answer questions about illnesses, medicines, travel, pregnancies and lifestyle. Registries ask these at sign-up and again if you are matched.
Examination
A doctor checks your heart, lungs, blood pressure and veins, and asks about any past problems with anaesthesia.
Blood tests
These look at your blood counts, kidney and liver function, and test for infections that could pass to the patient. An ECG or chest X-ray may be added.
A private decision
The results are shared with you first. If something is found, you are told in confidence and helped to get it looked after.
A final check before collection
If you are cleared, a shorter check is repeated close to the collection date. It confirms nothing has changed, such as a new infection, a pregnancy or a new medicine, before the patient starts their own preparation.
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Commonly believed
What do people wrongly assume rules them out?
"I have thalassaemia trait, so I cannot donate for my brother."
Many carriers of a trait donate for a sibling with thalassaemia major, because the trait does not cause the disease. The transplant team decides this after reviewing your blood tests, so do not rule yourself out in advance.
"Women cannot be donors."
Women donate just as men do. The main difference is that pregnancy pauses donation, and you will be asked about past pregnancies because they can affect how the patient's body reacts.
"A parent is too old to help."
A healthy parent can often donate as a half-matched donor. Age is weighed alongside general health, and older family donors are assessed carefully rather than turned away on age alone.
"Taking a daily tablet means I am not allowed."
Many common medicines are acceptable. Bring a list of everything you take to the assessment. Do not stop or change any medicine to make yourself eligible; the team will advise.
If the answer is no
What happens if you are told you cannot donate?
You have not failed anyone. The team found a reason donating would put you or the patient at risk, and saying so is part of their duty to both of you.
For a family donor
The patient still has options. Another sibling may match, a parent or child may be able to give as a half-matched donor, or a search can begin on unrelated donor registries or for cord blood. The transplant team will explain which of these fits the illness and how urgent it is.
For a registry volunteer
You may be told at sign-up, or only when you match. If a pause is temporary, you may be able to rejoin later. You can still help by encouraging eligible friends to register, or by giving blood where that is allowed.
Look after the finding
If the check picked up something about your own health, such as high blood pressure or an infection, follow it up with your own doctor. That result matters for you, whatever happens with the donation.
CION's haematology team can explain what an eligibility result means and help coordinate the next step with the transplant centre.
Did you know
Eligibility is checked more than once. A donor who was suitable at the first test is examined again closer to collection, because health can change in the weeks between matching and the transplant.
Questions we are asked
Common questions about donor eligibility
What is the age limit for a stem cell donor?
For unrelated registries, each registry sets its own joining age range, usually covering young and middle adulthood. For family donors there is no fixed limit. Children and older parents can donate if the medical check shows it is safe. Ask the registry or transplant centre for their current rule.
Can I donate if I have diabetes?
It depends. Registries often do not accept people who need insulin. A family donor with well-controlled diabetes may be accepted after review. Bring your recent sugar reports and medicine list, and never change your treatment on your own to try to qualify.
Can I donate if I smoke or drink alcohol?
Smoking or drinking does not automatically rule you out. It can raise anaesthesia risk and affect your recovery. The team will ask about both honestly. Cutting down before donation helps your own body, and is worth doing whatever the outcome.
Does my blood group need to match the patient's?
No. Stem cell matching is based on tissue type, not blood group. A donor with a different blood group can still be a good match. The patient's blood group may change after the transplant, which the team manages.
I had hepatitis years ago. Can I still donate?
This needs a doctor's review and blood tests. Some past infections leave no risk, while others can pass through donated cells. Tell the team exactly what you were told at the time and bring any old reports. They will decide what the tests show.
Can I donate while breastfeeding?
Usually donation is paused during pregnancy and for a period after birth, including while breastfeeding. If you are the only matched family donor, speak to the transplant team directly about timing. They will weigh the patient's needs against your safety and your baby's.
Will the tests find out things about my health?
They may. The checks look for infections, blood count problems and heart or kidney issues. Results are shared with you privately, not with the patient or family. You will be helped to follow up anything that needs care.
Who decides in the end?
A doctor at the transplant centre or registry decides whether donation is medically safe. You decide whether you want to go ahead. CION's haematology team can review the case, explain the result and help coordinate with a qualified centre, but does not collect stem cells itself.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- American Cancer Society — Stem cell transplant donors
- NHS — Stem cell and bone marrow transplants
- National Cancer Institute — Stem Cell Transplants in Cancer Treatment
- Leukemia & Lymphoma Society — Stem cell transplantation
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Being Typed as a Possible Donor: What HappensThe matching test before the health checkRisks to the Donor: An Honest AccountWhy some conditions make donation unsafeUnrelated Donor Registries in IndiaHow to join a registry if you are eligibleChildren as Donors for a SiblingHow the rules work for a child donor
Talk to us
Not sure whether you can donate?
Tell us what has been found so far. Our haematology team will explain the checks and help you reach a qualified transplant centre. One helpline serves every CION centre.