Blood Donor Compatibility Checker
Pick your blood group to see instantly who you can donate red blood cells to and who you can receive from. Scroll down for the full 8 by 8 compatibility chart and a simple guide to universal donors and recipients.
Full compatibility chart
Find the donor group on the left and read across to the recipient group at the top. A green check means donation is possible, a red cross means it is not.
Universal donor and recipient, explained
O negative (O-) — the universal donor. O negative red blood cells carry no A, no B and no Rh antigens, so almost any immune system accepts them. This is the group hospitals reach for in emergencies when there is no time to test.
AB positive (AB+) — the universal recipient. AB positive red blood cells carry both A and B antigens, and Rh positive people already accept the Rh antigen. So an AB positive person can receive red blood cells from any of the 8 groups.
The Rh rule in short: Rh negative red blood cells can be given to both Rh negative and Rh positive people of the same ABO group. Rh positive blood can only go to Rh positive people. ABO direction also matters: O can give to everyone, A can give to A and AB, B can give to B and AB, and AB can give only to AB.
How to use
- Press the button for your blood group.
- Read the two panels to see your donation and receiving options.
- Use the full chart below to compare any donor and recipient pair.
Tips
- O negative donors are especially valuable because they can help in any emergency — blood banks always need them.
- AB positive people are rare recipients, but that also means they can accept help from almost any donor.
- If you do not know your blood group, ask your local clinic or blood bank — the test is quick and free in most donation camps.
- Donating blood does not harm healthy adults, and one donation can help more than one patient.