Blood stem cell donation medical guidelines

To protect both donors and transplant recipients, we follow medical guidelines that help ensure every donation is as safe and effective as possible. These guidelines include age, weight, and health criteria, as well as policies related to certain medical conditions and sexual activity. If you're considering joining the registry, this section will help you understand who can donate and why these safeguards are important.

Have questions about becoming a blood stem cell donor? Visit our FAQ page to learn more about the donation process and what to expect.

Medical guidelines

Guidelines for donating blood stem cells aren’t the same as those for donating blood. The list below includes most, but not all, medical requirements. If you’re a match for a patient, we’ll discuss your health history further and arrange for a thorough physical exam.

Weight guidelines

If you’re called to donate, you’ll complete a health screening and physical exam before moving forward with donation. Medical guidelines for cell therapy product donation (such as peripheral blood stem cells and bone marrow), including BMI (body mass index), will be assessed to determine donation eligibility.

BMI is calculated using your weight and height. You may not be able to donate if your BMI (both underweight and overweight) presents a safety risk to either you or the patient. While we don’t have a guideline table listing minimum weight criteria, if you’re extremely underweight for your height, your current health status will require careful evaluation.

To find out the maximum weight (in pounds) for a given height (in feet and inches), see the chart below.

Age guidelines

NMDPSM is focused on recruiting younger people because medical research shows that blood stem cells from those donors provide the greatest chance for transplant success and long-term survival. Therefore, individuals over 40 are not able to join the registry. Likewise, anyone under 18 is unable to donate because donation is a medical procedure requiring informed consent, which minors are unable to give. And because it’s a voluntary procedure, parents/guardians can’t sign a release or give consent on their behalf. If you’re under 18, however, you can sign up for the pre-registry; you’ll be contacted about joining the registry when you turn 18. These age limits aren’t meant to discriminate. Rather, they’re in place for the best outcomes, health and safety of both the donor and patient.

Once you’re a member, you’ll remain on the registry until the age of 61, unless you request removal. While doctors frequently prefer younger donors to increase the odds of transplant success, there are times when donors between the ages of 40 and 60 are asked to donate.

Sexual orientation guidelines

If you identify as LGBTQIA+, there are no restrictions on joining the NMDP RegistrySM. If you’re called to donate, you’ll be asked to fill out a health history questionnaire and may be asked about your sexual activity, but your answers wouldn’t preclude you from donating.

Once a member of the NMDP Registry, you may opt in to be a potential donor for NMDP BioTherapiesSM. This is the part of NMDP that supports organizations that are creating next-generation cell and gene therapies.

Our cell and gene therapy partners are regulated by the Food and Drug Administration (FDA) and, depending on the therapy being made, may also be regulated by international requirements. A single donation from one person can potentially be manufactured into many doses that are given to different patients all over the world. That means the regulations and requirements may be different than those for blood stem cell transplants. Men who have had sex with men in the past 5 years or women who have had sex with a man who has had sex with a man in the past 5 years may not be able to donate to NMDP BioTherapies.

Ready to join?

Be a part of our donor registry and give hope to those in need.

Can’t donate right now?

Even if you don’t meet the current medical requirements, there are still powerful ways you can support patients in need.

Still have questions?

If you're unsure how these guidelines apply to you, contact your donor representative or explore our detailed FAQ section.