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HLA matching explained: what a 10/10 match really means | CION Cancer Clinics
A 10/10 HLA match means your tissue type agrees with the patient's on all ten markers transplant teams check: two copies each of five genes. A closer match usually lowers the chance of serious immune problems after a transplant. It does not decide on its own who donates, and it tells you nothing about your own health. This page explains the score, the report words and its limits. At CION Cancer Clinics, our haematology team assesses whether a transplant or CAR-T fits your situation and coordinates care with qualified centres.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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The short answer
What does a 10/10 match actually mean?
A 10/10 match means your tissue type and the patient's agree on all ten markers that transplant teams usually check. Those ten come from five genes, and you carry two copies of each: one from your mother and one from your father.
What HLA is
HLA stands for human leucocyte antigen. These are proteins on the surface of most cells in your body. Your immune system reads them like a name badge, to tell "mine" from "not mine". When stem cells from a donor go into a patient, the new immune system grows from those cells. If the badges differ too much, the new immune cells can treat the patient's body as foreign, and the patient's leftover immune cells can reject the new ones.
Why the number matters to you as a donor
If you have been asked for a cheek swab or a blood sample for a brother, sister, parent or a stranger on a registry, this is the number the team is looking at. A closer match usually means a lower chance of serious immune problems after the transplant. It does not decide on its own whether you will be chosen, and it says nothing about your own health.
A match score is about compatibility between two people. It is not a test result that says anything is wrong with you.Reading the score
Which five genes make up the ten markers?
Each gene gives two markers, so five genes give ten. Some centres count only four genes and report the score out of eight.
HLA-A, HLA-B and HLA-C
These three sit on almost every cell in the body. Differences here are strongly linked to rejection and to the new immune system attacking the patient's skin, gut and liver.
On a report you may see
- A*02:01, B*35:01, C*04:01
- Two results per gene, one from each parent
HLA-DRB1
This one sits mainly on immune cells. Teams give it heavy weight, and a difference here is usually taken seriously when choosing between donors.
HLA-DQB1
This is the fifth gene that turns an 8/8 score into a 10/10 score. Some teams treat a single difference here as more acceptable than a difference in the other four.
Your report may also mention DPB1. It is often checked, but it is not usually part of the ten.What a 9/10 means
One of the ten markers differs. Transplants with a single mismatch are done regularly when no full match is available. The team weighs which marker differs and whether the patient carries antibodies against it.
Not sure whether this applies to you?
Ask an oncologistStep by step
How does the team find out whether you match?
A first sample
You give a cheek swab or a small tube of blood. The laboratory reads your HLA genes from the DNA in those cells. You do not need to fast, and it takes a few minutes of your time.
Comparing the two reports
Your tissue type is laid beside the patient's, gene by gene. The team counts how many of the ten markers agree and notes exactly which ones do not.
Confirmatory typing
If you look like a possible donor, a fresh blood sample is tested again at high detail. This confirms the first result and rules out a sample mix-up before anyone plans around you.
The wider check
The transplant centre then looks at your age, general health, blood group and infection tests, and whether the patient has antibodies to any of your markers. Only then is a donor chosen.
On the report
What do the words on a typing report mean?
- Allele
- One exact version of a gene. Matching "at allele level" means the versions agree in fine detail, which is the standard for a 10/10 match.
- Antigen
- A broader group of alleles. Two people can match at antigen level and still differ at allele level.
- Haplotype
- The set of HLA genes you inherited together from one parent. You have two haplotypes, one from each side of the family.
- Mismatch
- A marker where donor and patient differ. A report may say "9/10, one mismatch at HLA-C".
- High resolution
- Typing done in fine detail, down to the exact allele. Early or registry typing is sometimes done at lower detail first.
- Donor-specific antibodies
- Antibodies in the patient's blood that target one of the donor's HLA markers. They can make a donor less suitable even when the score looks good.
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Commonly believed
What do families often get wrong about matching?
"Matching means having the same blood group."
Blood group and tissue type are separate. A donor with a different blood group can still be a full HLA match, and transplants across blood groups are done with extra care around the time of transfusion.
"Parents are always a perfect match for their children."
A parent gives a child only one of their two sets of HLA genes. That makes a parent a half match in almost every case. A full match from a parent is unusual.
"Anything less than 10/10 means the transplant cannot happen."
Many transplants now use a donor with one mismatch, a half-matched family member, or cord blood. The team compares the options and the risks of each. A lower score changes the plan; it does not automatically end it.
"If I match, I have to donate."
Being typed is not a promise. You can ask questions, take time and say no at any stage. It is kinder to say so early, before the patient starts the treatment that prepares them for your cells.
Did you know
HLA types run in communities and families. A patient is more likely to find an unrelated match in a registry that holds many donors with a similar family background, which is why registries in India ask people from every region and community to sign up.
Being straight with you
What can a match score not tell you?
A 10/10 score cannot tell you how the transplant will go. It lowers one kind of risk. The patient's disease, how well it responded to earlier treatment, their age and their other health problems all matter as much.
It does not always pick the donor
When there are two or more good matches, teams often prefer a younger donor, a donor whose sex and past pregnancies suit the patient, or a donor whose past exposure to a common virus called CMV matches the patient's. You may be a full match and still not be the first choice. That is a medical decision, not a judgement about you.
Who this page does not cover
Patients having their own stem cells collected and returned do not need a donor, so HLA matching does not apply to them. If that is your family's situation, ask the treating team which kind of transplant is planned.
CION's haematology team does not perform HLA typing or transplants on site. We review the reports, discuss the case at a tumour board and help your family reach a qualified transplant centre, with a list of questions to ask there.
Questions we are asked
Common questions about HLA matching
Is 8/8 the same as 10/10?
Not quite. An 8/8 score checks four genes, and a 10/10 score adds a fifth, HLA-DQB1. A donor who is 8/8 may turn out to be 9/10 or 10/10 once the fifth gene is read. Ask the transplant centre which scale your report uses before comparing two donors.
Can a brother or sister be a 10/10 match?
Yes. Brothers and sisters with the same two parents have the highest chance of all relatives of being a full match, because they may have inherited the same set of genes from each parent. Many still turn out not to match, which is why every brother and sister is usually tested.
Does a better match mean fewer problems after transplant?
It usually means a lower chance of graft-versus-host disease, where the donor's immune cells attack the patient's skin, gut or liver. It does not remove that risk. Medicines to calm the new immune system are still given, and the patient is still watched closely for months.
Will my HLA type change as I get older?
No. Your HLA type is set by the genes you were born with and stays the same for life. What can change is your health, your weight and whether you have had pregnancies or transfusions, which is why the centre checks those again closer to the time.
Why do they need a second blood sample if I already matched?
The second sample confirms the result at high detail and makes sure the first sample was really yours. Registries and transplant centres do this for every donor. It also checks for infections that could pass to the patient, and for your blood group.
Is the typing test risky or uncomfortable?
A cheek swab is simply rubbed on the inside of your cheek. A blood sample feels like any routine blood test, with a small bruise at most. Neither test commits you to donating, and neither puts anything into your body.
Who can see my HLA results?
The results go to the laboratory, the transplant team and, if you joined one, the registry. They are medical records and should be kept confidential. Ask how your sample and data will be stored before you sign the consent form, and whether you can withdraw later.
Can CION tell us whether a match on our report is good enough?
Our haematology team can read the report with you and explain what each line means. The final choice of donor is made by the transplant centre, which sees tests we do not. We can help you prepare questions for that meeting and coordinate the referral.
Your Haematologist
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- American Cancer Society — Stem cell transplant donors
- National Cancer Institute — Stem Cell Transplants in Cancer Treatment
- NHS — Stem cell and bone marrow transplants
- Leukemia & Lymphoma Society — Stem cell transplantation
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Sibling Matching Odds: The One-in-Four NumberWhy every brother and sister is testedHaploidentical Transplant: Using a Half-Matched DonorWhat happens when there is no full matchBeing Typed as a Possible Donor: What HappensThe swab or blood test, step by stepDonors, HLA Matching and Stem Cell CollectionEvery donor guide in one place
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Holding an HLA report you cannot read?
Share it with our haematology team. We will explain what it says and help your family reach a qualified transplant centre. One helpline serves every CION centre.