Article Under Review
This article is undergoing editorial and medical review. We regularly update content as part of our commitment to providing patient-centered, accurate, evidence-based information.
Overview
Donation can happen two ways. You can give to a family member you already know. Or you can help a stranger matched to you through a national registry. Both paths can lead to a successful transplant. They feel very different emotionally.
Family donation moves quickly because your family member needs you. But it feels heavier. You know them. You will see how they do after transplant. Registry donation takes months to match but feels simpler in some ways. No family pressure. You help a stranger you may never meet. Both choices are meaningful and generous. Choose the path that fits what you can handle emotionally and practically.
Two pathways for donation
Two pathways for donation. Both save lives, but the experience differs:
- Family donation. You already know the recipient, move through evaluation quickly
- Registry donation. You help a stranger, longer matching process but less family pressure
- Both save lives and represent generous choices
- Emotional experience differs significantly between pathways
- Your donation is equally valuable either way
Donating for a family member
When a close relative needs a stem cell transplant and you're a potential match, you face an immediate decision. Family donations often move faster than registry matches because you're already identified and available. Your family member's medical team can reach out directly, and you can start evaluation quickly.
Family donation carries special emotional weight. You might feel pressure from your family's hopes, from seeing your relative suffer, or from knowing you could help. You might also feel genuine joy at the chance to save someone you love. These mixed feelings are normal and worth processing with support.
What to expect as a family donor. Your experience will include:
- Family matches move quickly to evaluation
- You already know the recipient and outcome
- Emotional stakes feel higher than unrelated donation
- You can ask about the patient's progress
- Genetic relationship determines match quality
Family matches have different odds depending on your relationship. Identical twins are perfect matches. Siblings have a 25% chance of perfect match. Parents and adult children have different odds. Your transplant center explains your specific match quality with the patient.
Donating for a stranger
Registry donors match with patients they may never meet. The matching process is slower because doctors search for your match among thousands of waiting patients. If you match, you're contacted and invited to complete evaluation and donation. Many donors never learn if their patient survives.
What to expect as a registry donor. Your experience will include:
- Registry matching takes time and patience
- You help someone with no prior connection
- Less family emotional pressure
- Patient outcome is independent of you
- Critical for underrepresented communities
- Matching process can take months or longer
Donating for a stranger can feel freeing in some ways. There's no family pressure. You're helping someone, but their outcome doesn't depend on your personal relationship. Some donors find this emotionally easier than donating for family. The act of giving to someone you'll never know can feel pure and meaningful.
How registry matching works
Registry matching is a systematic process designed to find the best possible genetic match. After you provide a cheek swab and HLA typing, your information enters the national registry database. When a patient needs a transplant, doctors search the registry for donors who match that patient's HLA type as closely as possible.
If you're selected as a potential match, you'll be contacted. Your matching center will confirm your continued willingness to donate, update your health information, and schedule a confirmatory test. The patient's medical team makes the final decision about whether to use your cells. Only then do you move forward with full evaluation and collection.
Registry matching steps. The process unfolds systematically:
- Patient needs transplant and doctors search registry
- Your HLA type matched against thousands of profiles
- Selected as potential match (among several candidates)
- Called by matching center for confirmation
- Confirmatory testing takes 2-4 weeks
- You can withdraw anytime during this period
HLA typing
HLA (Human Leukocyte Antigen) is a group of proteins that mark your cells as "self" versus "foreign." Perfect HLA matching means the recipient's body accepts your cells without attacking them.
Understanding HLA matching. Genetic matching is the key:
- HLA testing looks at six major genes (HLA-A, HLA-B, HLA-DR)
- Different populations carry different HLA types
- Diversity in registries is crucial for patient matching
- Your HLA type is inherited from both parents
- Perfect matching reduces rejection risk significantly
Confirmatory testing
Once you're selected as a potential match, your blood is drawn for confirmatory testing. This higher-resolution HLA testing ensures you truly match the patient at a detailed genetic level. Additional tests check for HLA antibodies that could cause problems. Blood cultures screen for bacteria. You'll have a quick physical exam and blood work to confirm you're still healthy.
Confirmatory testing details. The process is thorough:
- High-resolution HLA testing at genetic level
- HLA antibody screening (pre-formed donor antibodies)
- Blood cultures to screen for bacteria
- Physical exam and blood work to confirm health
- Takes 2-4 weeks to complete fully
During this time, you have the right to withdraw anytime. Many patients begin preparation for transplant during this period, but they understand that donors can change their minds. If you decide donation isn't right for you, the patient's team will pursue other options.
Moving into evaluation
Once you're confirmed as a match, you'll move into evaluation. For unrelated donors, evaluation might take 4-8 weeks from match confirmation. For family donors, it might happen faster. During evaluation, you'll see your coordination center's doctor, complete blood work and imaging, and possibly meet with a mental health counselor.
Your coordinator becomes your main point of contact. They answer questions, schedule appointments, and help you prepare emotionally and practically. They're familiar with donation and can demystify the process. Many donors report that having one person to call makes everything feel less overwhelming.
Your evaluation includes. The process is comprehensive:
- Evaluation typically takes 4-8 weeks
- Regular phone and in-person contact with your coordinator
- Medical testing confirms your health
- Mental health support is available
- You'll know basic information about the patient
You'll learn which collection method (PBSC or bone marrow) will be used. You'll discuss your medical history in detail. You might learn your recipient's age or condition, though you typically won't learn their name or see their photo until after donation.
The urgency of the request
When you're matched, the urgency varies. Some patients can wait a month for donation because their leukemia is in remission or their condition is stable. Others need a transplant immediately because their disease is progressing. Your medical team and the patient's team will discuss timing with you.
Timing considerations. Urgency affects the pace:
- Urgency depends on the patient's disease progression
- Urgent cases move through evaluation in 1-2 weeks
- Standard cases take 4-8 weeks
- You can advocate for time you need even if urgent
- Patient teams have backup plans if timing doesn't work
- Your welfare matters and timing is negotiable
Even in urgent situations, you retain the right to delay donation if you need more time to prepare. Your coordination center will work with you to find a timeline that works. If donation truly isn't possible at that moment, the patient's team has backup plans.
Additional Detailed Information
Additional Information
Match quality definitions
Perfect match. Six of six HLA match at high resolution means the donor and recipient are genetically identical at all HLA loci tested. This happens most commonly in identical twins. Perfect matches have the lowest risk of rejection and graft-versus-host disease.
Matched related donor (MRD). Family members who are perfect HLA matches through genetic inheritance. Siblings have a 25% chance of being perfect matches; parents and adult children have different probability patterns. MRD transplants have excellent long-term outcomes.
Matched unrelated donor (MUD). Registry donors who match the patient at 10/10 HLA loci at high resolution. Despite being unrelated, the genetic similarity is excellent. Some MUD donors are more distantly related than initially believed—up to 0.5% of "unrelated" pairs are actually distant relatives.
Haploidentical donor. A donor matched at only half their HLA genes—typically a parent or a sibling with a different HLA inheritance pattern. Haploidentical transplants historically had higher failure rates but newer techniques have improved outcomes substantially.
Confirmatory testing details
High-resolution HLA typing. Uses DNA sequencing or specialized techniques to determine the precise HLA sequence at all six loci, often down to the individual nucleotide level. Two donors might both appear to match at intermediate resolution but differ at high resolution.
HLA antibody screening. Detects antibodies in the donor's blood that recognize the recipient's HLA type. These pre-formed donor antibodies can cause immediate rejection. Absence of HLA antibodies is strongly favorable.
Mixed lymphocyte reaction (MLR). A functional test where donor and recipient lymphocytes are incubated together to assess immune compatibility. Reduced reactivity predicts better outcomes, though this test is used less frequently in modern practice.
Registry search and notification processes
National search algorithm. The NMDP and international exchanges use complex algorithms to search millions of donors when a patient needs a transplant. The algorithm weighs HLA match quality, donor age and health, CMV status, and other factors. Multiple donors might be identified for consideration.
Donor notification methods. Matched donors are contacted via phone, email, and postal mail. Your original registry information is activated. You have 24-48 hours to confirm your willingness to proceed. If you decline, the search continues with the next best matches.
Written By:
Transplants.org Staff
Last Reviewed: February 26, 2026
Informed By:
Transplants.org, with participation from 23 leading U.S. transplant centers, led the largest comparative analysis of patient educational materials in transplant history. We recognize the participating centers who helped inform and inspire our direction with initial patient-centered educational content:
- Mayo Clinic (Co-Author)
- Vanderbilt University Medical Center (Co-Author)
- Johns Hopkins Hospital (Co-Author)
- UCLA Medical Center (Co-Author)
- UCSF Medical Center (Co-Author)
Transplants.org is an independent nonprofit organization and participation is not an endorsement by these organizations.
