Can I donate bone marrow?
Most healthy adults aged 18 to 40 can donate — both men and women. Here is exactly who can donate, what disqualifies you, and how to register.
Free • 5-minute online signup • The registry handles the full eligibility check
The quick answer
Eligibility comes down to three things: your age, your general health, and whether you have one of a defined set of conditions that rule donation out. Most healthy adults clear all three. Here is the short version before the detail further down the page.
You can likely donate if
You are between 18 and 40 years old, generally healthy, your BMI is within the typical donor range (varies by registry — often up to about 40), and you do not have one of a defined list of disqualifying medical conditions. Both men and women can donate.
You probably cannot donate if
You are under 18 or over the registry's upper age limit (often 60 with restrictions, with 18 to 40 preferred), you have a serious chronic disease, you have certain bloodborne conditions, you are currently pregnant, or you are immunocompromised.
The full check happens at signup
You provide your medical history during the cheek-swab signup, and the registry tells you whether you qualify before any further commitment. Nothing about donating is decided before you have that answer.
Free • 5-minute online signup • The registry handles the full eligibility check
The "only males can donate" myth — what's actually true
A belief that circulates online, and is surprisingly persistent on social media, is that only males can donate bone marrow because female-donor cells are less compatible. That is factually wrong. If you came to this page thinking your gender ruled you out, it almost certainly does not.
Both genders donate bone marrow, and the registry actively recruits both. In fact, women made up 57% of the people who donated worldwide in 2024, according to the WMDA Global Trends Report 2024 — and female donors are matched and go on to donate in large numbers every year.
The myth has a kernel of real science behind it, which is why it persists. When other factors are equal, some research links donor sex to transplant outcomes — in particular, a female donor for a male recipient has been associated with a somewhat higher rate of certain complications, so a transplant team may prefer a male donor for a specific male patient. A large analysis in Biology of Blood and Marrow Transplantation (2018) examined donor sex among the non-HLA factors that influence survival. That is one consideration among many, weighed alongside HLA match, donor age, and the patient's condition. It is not a rule, it does not disqualify female donors, and it is not a reason for women to skip registering — the registry needs them.
Free • 5-minute online signup • The registry handles the full eligibility check
Detailed eligibility requirements
The lists below reflect typical US registry guidance. Exact thresholds differ slightly between registries, and the registry always makes the final call from the health history you provide at signup. Use this to get a strong sense of where you stand before you register.
Age
- The US registry sweet spot is 18 to 40 — the range that is most actively matched and called on.
- Many registries accept registrations up to age 60 in special programs, but registering after 40 carries a lower probability of being called.
- Why younger: medical evidence links younger donor cells to better outcomes, which is why registries prioritize the 18-to-40 range.
Health basics
- Generally good overall health
- BMI typically under 40 (varies by registry — confirm at signup)
- No active infections
- No serious chronic conditions in active treatment
Conditions that disqualify
- Active cancer (most types). Some past cancers treated more than five years ago may be acceptable, depending on cancer type and registry.
- HIV-positive status — disqualifying for marrow donation
- Hepatitis B or C — disqualifying
- Multiple sclerosis, lupus, and most active autoimmune diseases — usually disqualifying
- Hemophilia and serious bleeding disorders — disqualifying
- Heart disease (recent heart attack, active cardiovascular treatment) — disqualifying
- Severe asthma requiring chronic treatment — sometimes disqualifying
- Pregnancy or breastfeeding — temporary disqualification
- Current chemotherapy treatment — disqualifying
Conditions that do not disqualify
- Tattoos and piercings, once healed for 12 or more months
- Controlled, well-managed conditions such as mild asthma, controlled diabetes, or hypertension under management
- Common medications such as SSRIs, statins, or birth control
- Recent cosmetic surgery, once healed
- Being a current or former smoker
- Past mild illnesses or surgeries unrelated to bloodborne conditions
Specific scenarios
- Can I donate with diabetes? It depends on the type and how well it is controlled. Well-managed type 2 is often acceptable; type 1, which involves insulin dependence, is typically not. This is a registry decision made from your medical history.
- Can I donate after cancer? Possibly. The time since treatment, the cancer type, and your current health all matter. Many active cancers are disqualifying, while some treated more than five years ago may be acceptable. The registry reviews it case by case.
- Can I donate with tattoos? Usually yes, if they have been healed for 12 or more months. The waiting period is about ruling out infection, not the tattoo itself.
- Can I donate at 50? You can register and you remain eligible. You are simply less likely to be called than a donor in the prioritized 18-to-40 range, because younger cells are linked to better outcomes.
How often can you donate?
- Donating more than once in a lifetime is medically possible, though repeat donations are uncommon.
- Any second donation is decided case by case by the registry, based on your health and the patient's need.
- Some donors are asked to donate again for the same patient (a “boost”) in addition to the original donation.
- Your blood-forming stem cells regenerate within about four to six weeks, which is what makes multiple donations across a lifetime medically feasible.
The federal donor program in the US is administered through the HRSA C.W. Bill Young Cell Transplantation Program, which publishes the donor program data behind these figures, and the National Cancer Institute explains how the donated stem cells are replaced by the body after collection. Whether a donor gives more than once is set by individual registries as a matter of policy, decided case by case.
The reason repeat donation is possible at all is that you do not lose your stem cells permanently. The cells you give are the blood-forming kind your body continuously makes, and they return to their baseline level within a few weeks. A donation does not reduce your own long-term blood or immune function. That is also why a registry can ask a willing donor to give again for the same patient if the first transplant needs reinforcement, while still keeping a comfortable gap between collections.
What happens at signup
- You order a free cheek-swab kit online, or pick one up at a registration drive.
- You complete a health-history form — this is where the eligibility filter actually happens.
- You return the cheek swab, and the registry tests your HLA type and stores your profile.
- If you are matched in the future, you go through a second, more detailed health screening before any donation.
- You can decline at any point. There is no obligation until you confirm at that second screening.
For the actual registration flow and how to find the right registry for your country, see how to find your bone marrow registry.
Free • 5-minute online signup • The registry handles the full eligibility check
Frequently asked questions
What to do next
If eligibility was your main question and it is answered, here are the next things most people want to know before they register.
- Wondering if it’s painful? Does bone marrow donation hurt?
- Wondering about compensation? Do you get paid to donate?
- Curious how the donation goes? How bone marrow donation works
- Curious how matching works? How HLA matching works
- Ready to sign up? Find your bone marrow registry
You now know the age range, the conditions that matter, and the truth about who can donate. Registering is free, takes about five minutes online, and the registry handles the full eligibility check from there.
Free • 5-minute online signup • The registry handles the full eligibility check