Your donor ID number lives in a different place depending on what you donated, and the steps to retrieve it vary accordingly. A blood donor, a sperm or egg donor, a plasma donor, and a bone marrow registrant each receive a distinct identifier issued by a different organization, stored in a different system, and recovered through a different process. The good news is that in almost every case, the number already exists in a database somewhere and can be retrieved with a phone call, an app login, or a short email.
Blood Donation IDs
If you have donated whole blood or platelets through a major blood center like the American Red Cross, Vitalant, or OneBlood, you were assigned a donor identification number at your first visit. This number stays with you for life across that organization and links every unit you have ever donated to your health screening records and blood type.
The fastest way to find it is usually through the organization’s app or online portal. The Red Cross, for instance, lets you log in to the Red Cross Blood Donor App or the website with the email address you used at registration. Your donor ID appears on your digital donor card. If you never set up an online account, your physical donor card, the one you may have received at your first donation, has the number printed on it. Lost the card and never made an account? Call the donor services line for whatever organization collected your blood. They can look you up by name, date of birth, and Social Security number or the phone number on file. You will typically need to verify your identity before they release the number.
One detail that trips people up: if you have donated at more than one blood center, you have more than one donor ID. A Red Cross number does not carry over to Vitalant, and vice versa. Each organization maintains its own donor registry. Behind the scenes, however, the units themselves are labeled using a shared international coding system called ISBT 128, which ensures that a bag of blood can be tracked and identified no matter where it ends up.
Plasma Donation Center IDs
Commercial plasma centers like BioLife, CSL Plasma, Grifols (formerly Biomat), and Octapharma Plasma also assign each donor a unique ID at enrollment. Because these centers compensate donors, the ID is tied not only to your medical screening but also to your payment method, usually a prepaid debit card.
Most plasma companies now have a mobile app. Log in with the credentials you created when you first registered, and your donor number will be visible in your profile or on a digital version of your donor card. If you cannot access the app, visit your home center in person with a photo ID. The front desk staff can pull up your profile and give you the number on the spot. You can also call the center directly, though wait times can be long.
A common situation is that someone donated plasma years ago, stopped, and now wants to return or needs the number for a different reason. If the center has closed or merged with another company, the records usually transferred to the acquiring company. CSL Plasma absorbed several smaller networks over the years, for instance, and donor records migrated with them. Start by contacting the parent company’s customer service line and providing as much identifying information as you can.
Sperm and Egg Donor IDs
If you donated sperm or eggs through a cryobank or fertility clinic, you were assigned a donor number that serves a very different purpose than a blood donor ID. This number is the primary way that recipient families, and sometimes donor-conceived offspring, reference you without knowing your legal name. It appears on vials, medical records, and donor catalogs.
To retrieve your number, contact the cryobank or clinic where you donated. Major sperm banks like California Cryobank, Fairfax Cryobank, and Seattle Sperm Bank each maintain their own numbering systems. If you donated eggs through a clinic-affiliated agency, the agency or the clinic’s third-party egg donor coordinator will have your file. You will need to verify your identity, and the process can take a few days because reproductive tissue banks tend to be more cautious about releasing information, even back to the donor.
The donor number matters here more than in almost any other context, because it is often the only link between a donor and any children conceived from their gametes. A survey of 165 donor-conceived offspring found that roughly two-thirds were searching for both their donor and their donor siblings, while smaller groups were looking for one or the other.
1Reprod Biomed Online / PubMed Central. Experiences of offspring searching for and contacting their donor siblings and donorThe donor ID number is the starting thread in those searches. If you are a donor who wants to be findable, or a donor-conceived person trying to trace your origins, having the correct donor number is the essential first step.
What If You Are Donor-Conceived and Looking for the Number
If you were conceived using donor sperm or eggs, the donor ID number you need is not yours in the traditional sense. It belongs to the person who provided the gametes, and it was assigned by the cryobank or clinic your parents used. Getting it requires a conversation with your parents or legal guardians, who received the number when they selected the donor.
The number typically appears on the paperwork your parents signed, on any donor profile printouts they saved, and in the medical records of the fertility clinic that performed the insemination or embryo transfer. If your parents did not keep the paperwork, the clinic may still have it on file, though record-retention policies vary and some clinics have closed over the decades. In the United States, there is no centralized federal registry of gamete donors, so the cryobank’s own records are usually the only official source.
Once you have the donor number, you can use it to search registries like the Donor Sibling Registry, where donors and donor-conceived people voluntarily list themselves by cryobank and donor number. A growing number of jurisdictions are also moving toward systems where donors agree at the time of donation to have their identity released when offspring reach adulthood. A recent national study of oocyte and sperm donors found that the vast majority wanted to be notified if their identity was requested, and about seven in ten had positive attitudes toward potential contact with donor-conceived offspring.
2Oxford Academic (Human Reproduction). Are open-identity donors prepared for release of their identity? Long-term follow-up of a national sample of oocyte and sperm donorsBone Marrow and Stem Cell Registry IDs
If you joined a bone marrow or stem cell donor registry like Be The Match (the National Marrow Donor Program in the United States) or one of the international registries coordinated through the World Marrow Donor Association, you were given a registry ID number at enrollment. This is the number that links your tissue-typing results to your profile and allows transplant centers around the world to request further testing or donation if you match a patient.
To find your Be The Match donor ID, log in to your account on the Be The Match website or app. If you never created an online account, or if you joined by swabbing your cheek at a campus drive years ago and cannot remember the details, call Be The Match directly. They can look you up using your name, date of birth, and contact information. The process is straightforward because the registry actively wants to keep your information current so they can reach you if a patient needs you.
Internationally, stem cell donor registries use a system called the Global Registration Identifier for Donors, or GRID. This was developed specifically because the growing number of volunteer donors worldwide created a real risk of identification errors when donor information crossed borders and languages. The GRID assigns each donor a globally unique identifier with a defined structure and set of rules, so that a registry in Germany and a transplant center in Japan are unambiguously referring to the same person.
3PubMed Central. Global Registration Identifier for Donors (GRID) of Hematopoietic Stem Cells: Road to Automation and SafetyIf you registered through any major national registry, you have a GRID, and your national registry can provide it.
Organ Donation IDs
Organ donation IDs work differently from the others because the two main paths, registering as a potential deceased donor and being a living donor, involve completely different systems.
If you registered as an organ donor through your state’s DMV or through a site like registerme.org, your registration is stored in your state’s donor registry. There is no single national ID number for this. Each state maintains its own database, and your “ID” is essentially your entry in that database, typically linked to your driver’s license number. To confirm your registration status, visit your state’s donor registry website or check with the DMV. You can also call Donate Life America, the organization that coordinates the state registries, for guidance.
If you were a living organ donor, your information is tracked by the Organ Procurement and Transplantation Network, which is administered by the United Network for Organ Sharing. A database of living donors is maintained there, capturing perioperative information related to the transplant.
4JAMA Network Open. Assessment of Postdonation Outcomes in US Living Kidney Donors Using Publicly Available Data SetsYour transplant center is the best point of contact if you need to retrieve records or an ID associated with your donation. UNOS can also help you navigate the system, though they will direct you back to the transplant center for most detailed records.
The Coding System Behind the Scenes
Regardless of which type of donor you are, there is a good chance that the biological product associated with your donation, whether a bag of blood, a vial of plasma, or a unit of stem cells, was labeled using a standardized coding system called ISBT 128. This is the global standard for identifying, labeling, and transferring information about human blood, cell, tissue, and organ products across international borders and different healthcare systems.
5PubMed Central. ISBT 128: a global information standardYou do not need to know your ISBT 128 code for any practical purpose as a donor. But understanding that it exists helps explain why donation centers are so particular about identity verification. The coding system was designed to prevent exactly the kinds of mix-ups that can be catastrophic in transfusion and transplant medicine: two donors confused for each other, a blood type recorded incorrectly, a unit of cells shipped to the wrong hospital. The system has been in use for over 25 years and has become deeply embedded in how blood banks and tissue banks worldwide operate.
6PubMed Central. Twenty-five years later: has ISBT 128 fulfilled its promise?This is worth knowing because it explains a frustration many donors encounter: the feeling that retrieving a simple number should not require so many verification steps. The security around donor IDs is not bureaucratic laziness. It reflects the fact that these numbers are connected to safety-critical medical systems where a wrong match could harm a patient.
When Your Donor Number Has Changed or Disappeared
One of the most common reasons people struggle to find their donor ID is that the organization that issued it no longer exists, at least not in the form they remember. Blood banks merge. Plasma companies rebrand. Fertility clinics close. Bone marrow registries consolidate across borders. When any of these things happen, donor records usually transfer to the successor organization, but the process is not always seamless and the original ID number sometimes changes.
If you donated blood at a center that later merged with a larger network, your records almost certainly migrated, but your old donor number may have been replaced with a new one in the successor’s system. The easiest fix is to show up at any center in the new network with photo ID. They will find your records using your personal information and issue whatever new number applies.
For gamete donors, a closed fertility clinic presents a harder problem. In the United States, clinics are generally required to maintain medical records for a period set by state law, often seven to ten years, but after that, records can be destroyed or transferred to a storage facility. If you donated sperm or eggs more than a decade ago at a clinic that has since closed, start by contacting the state medical board, which may know where the records went. The cryobank itself, if it was a separate entity from the clinic, may also still have your file.
Stem cell registries tend to be more durable because they are maintained by large national organizations with governmental or quasi-governmental backing. Even if you joined through a small community drive, your data flows up to the national registry. The GRID system was built in part to solve exactly this problem of fragmentation, ensuring that a donor’s identity persists even as the landscape of registries changes around them.
3PubMed Central. Global Registration Identifier for Donors (GRID) of Hematopoietic Stem Cells: Road to Automation and SafetyKeeping Your Donor Information Accessible
Whatever type of donor you are, a few practical steps save headaches later. Write down your donor ID number and the name of the organization that issued it, and store both in a place you will not lose, like a password manager or a personal health file. If the organization has an app, set up an account now rather than trying to recover one years from now. Update your contact information whenever you move or change your phone number, especially if you are on a bone marrow registry where the whole point is being reachable when a match appears.
For gamete donors specifically, consider whether you want to be findable in the future. If you donated anonymously but are open to contact, registering your donor number on a voluntary matching site gives donor-conceived individuals a way to reach you. If you prefer to remain anonymous, know that consumer DNA testing has made true anonymity increasingly difficult regardless of what the cryobank’s original agreement promised. Having your donor number on hand at least lets you engage with these questions on your own terms rather than being caught off guard.
For blood and plasma donors, keeping your ID accessible makes repeat donations faster and smoother. Centers can look you up without it, but having your number ready shaves time off the check-in process, which is a small kindness to yourself when you are already giving up an hour or more of your day to help someone else.