If you’re wondering who cannot donate bone marrow, here’s the short answer: anyone with an active or past blood cancer, HIV, certain autoimmune diseases, or serious organ dysfunction is permanently disqualified. People over age 60, those under 18, individuals with a BMI over 40, and anyone with active infections are also ineligible at most registries. Some disqualifications are temporary — others are lifelong.
About 70% of patients who need a bone marrow transplant don’t have a matching family donor, so they depend on volunteer registries like Be The Match (the National Marrow Donor Program). That means every potential donor matters. But registries maintain strict eligibility criteria to protect both the donor and the recipient, whose immune system will essentially be wiped out and rebuilt using your cells. The stakes are enormous — an unhealthy donation can be fatal for the recipient.
Permanent Disqualifications: Who Can Never Donate
Some conditions permanently exclude you from bone marrow donation. These aren’t judgment calls — they represent genuine risks of transmitting disease or harming either party.
| Category | Specific Disqualifiers | Reason |
|---|---|---|
| Infectious diseases | HIV, HTLV, hepatitis B or C (active or past) | Risk of transmission to immunocompromised recipient |
| Blood cancers | Leukemia, lymphoma, myeloma — any history | Malignant cells could be transplanted |
| Autoimmune diseases | Systemic lupus (SLE), multiple sclerosis, rheumatoid arthritis on immunosuppressants | Donor immune cells may attack recipient’s organs (graft-versus-host disease risk) |
| Organ dysfunction | Severe kidney disease, liver cirrhosis, heart failure | Donation procedure poses unacceptable risk to donor |
| Neurological conditions | Creutzfeldt-Jakob disease (CJD) or family history of CJD | Prion diseases are untestable and always fatal |
| Bleeding disorders | Severe hemophilia, clotting factor deficiencies | Procedural bleeding risk for donor; potential transmission of defective stem cells |
Temporary Disqualifications: You May Qualify Later
Many people are turned away temporarily, not permanently. These deferral periods vary by registry, but the most common ones include:
- Recent tattoos or piercings: 4–12 month deferral depending on whether the facility was state-regulated
- Pregnancy: Ineligible during pregnancy and for 6 weeks postpartum
- Malaria-risk travel: Travel to endemic areas (sub-Saharan Africa, parts of Southeast Asia) triggers a 1–3 year deferral
- Blood transfusion in the UK (1980–1996): Permanent deferral due to variant CJD risk — this catches many people off guard
- Active infections: Even a simple course of antibiotics for strep throat means you need to wait until treatment is complete and symptoms resolve
- Recent vaccination: Live vaccines (MMR, yellow fever) require a 4-week waiting period
Age and Weight Restrictions
Most registries, including Be The Match, accept new donors between ages 18 and 40. If you’re already on the registry, you can remain active until age 60. Why the cutoff? Data from the Center for International Blood and Marrow Transplant Research (CIBMTR) consistently shows that younger donors produce better transplant outcomes — recipients of marrow from donors under 35 have measurably higher survival rates.
BMI matters too. A BMI over 40 typically disqualifies you because of anesthesia risks during surgical marrow harvest. Some registries set the threshold at BMI 35. If your BMI is between 30 and 40, you may still qualify but will undergo additional cardiac and pulmonary screening.
What the Screening Process Actually Looks Like
Getting on the registry is easy — it’s a cheek swab. But if you’re actually matched with a patient, the real screening begins. Here’s what to expect:
- Comprehensive blood panel: CBC, metabolic panel, liver and kidney function, coagulation studies
- Infectious disease screening: HIV 1/2, hepatitis B surface antigen, hepatitis C antibody, HTLV I/II, syphilis (RPR), CMV, EBV, and West Nile virus during season
- HLA typing confirmation: High-resolution DNA-based matching to verify compatibility
- Physical exam: Full exam with EKG; chest X-ray for surgical harvest donors
- Psychological assessment: To confirm informed consent and willingness without coercion
This process takes 2–6 weeks. About 1 in 430 Be The Match registrants is ultimately selected as a donor, so most people who sign up will never go through this step.
Common Conditions That Surprise People
Some conditions you’d think would disqualify you actually don’t. Well-controlled type 2 diabetes without organ damage? Usually fine. Asthma managed with inhalers? Typically acceptable. A history of non-hematologic cancer that’s been in remission for 5+ years (like early-stage skin cancer)? Often eligible, evaluated case by case.
On the flip side, conditions like psoriasis and Crohn’s disease — which many people consider minor — can disqualify you because they involve immune dysregulation that could transfer to the recipient.
When to Talk to the Registry (Not Just Your Doctor)
If you have a borderline condition, don’t self-disqualify. Registries have medical teams that evaluate edge cases individually. Call Be The Match at 1-800-MARROW-2 and describe your situation. They’ll give you a definitive answer.
Even if you can’t donate marrow, you may still be able to help. Peripheral blood stem cell (PBSC) donation — which involves injections of filgrastim (Neupogen) for 5 days followed by a blood draw similar to dialysis — has different risk profiles and may be an option for some people who can’t undergo surgical harvest.
Frequently Asked Questions
Can you donate bone marrow if you have depression or take antidepressants?
In most cases, yes. Stable mental health conditions managed with SSRIs or SNRIs do not disqualify you. However, lithium use requires additional evaluation because it affects white blood cell counts. The registry’s medical team makes the final call.
Does having a tattoo permanently disqualify you from donating bone marrow?
No — tattoos cause a temporary deferral of 4 to 12 months, not a permanent one. If the tattoo was done at a state-regulated facility, some registries reduce the waiting period. After the deferral window, you’re fully eligible.
Can someone with sickle cell trait donate bone marrow?
Sickle cell trait (carrying one copy of the HbS gene) does not automatically disqualify you. However, it requires careful evaluation. If the recipient has sickle cell disease and the transplant goal is to cure it, a donor with sickle cell trait would not be ideal. For other recipients, trait carriers may qualify.
Is there an upper weight limit for bone marrow donation?
Yes. Most registries use a BMI cutoff of 40. Surgical marrow harvest requires general or regional anesthesia, and severe obesity significantly increases anesthesia complications. If your BMI is between 35 and 40, expect additional cardiopulmonary testing before clearance.
Can cancer survivors ever donate bone marrow?
It depends on the type of cancer. Any history of blood cancer (leukemia, lymphoma, myeloma) is a permanent disqualification. For solid tumors — breast cancer, colon cancer, melanoma — survivors may be eligible after 5 years of confirmed remission, evaluated on a case-by-case basis. Basal cell skin cancer alone usually doesn’t disqualify you.
Key Takeaways
- Permanent disqualifiers include HIV, hepatitis B/C, any blood cancer history, and severe autoimmune diseases
- Age limits are 18–40 for new registrants; active donors can stay until 60
- BMI over 40 is generally disqualifying; BMI 35–40 requires extra screening
- Many conditions (tattoos, travel, pregnancy, infections) cause only temporary deferrals
- Don’t self-disqualify — contact the registry directly for borderline cases
- Even if you can’t donate, spreading the word helps: only 2% of the U.S. population is on the registry
