Blood Group Compatibility
Who can donate to & receive from each ABO/Rh blood group.
A searchable blood group compatibility chart for all eight ABO and Rh blood types (O−, O+, A−, A+, B−, B+, AB−, AB+). See who each group can donate red blood cells to and receive from, which group is the universal donor (O−) and universal recipient (AB+), the Rh factor and a rough global prevalence. Search a group, filter by Rh and tap to copy. Educational reference — real transfusions use a lab cross-match. Runs fully in your browser — no API.
How to use Blood Group Compatibility
Open the chart
Launch this free blood group compatibility tool to see donor and recipient matches for all eight ABO/Rh blood types as clear cards.
Search a group
Type a blood group like O- or AB+ into the search box to jump straight to its compatibility card.
Filter by Rh
Use the Rh filter to show only Rh-positive or Rh-negative blood groups.
Check donors
Read the blue 'Can receive from' section to see which groups can safely donate red cells to a given patient.
Check recipients
Read the green 'Can donate to' section to see which patients a donor's blood is compatible with.
Verify medically
Use this as a learning reference only — a hospital always confirms compatibility with a laboratory cross-match before any transfusion.
Frequently asked questions
Which blood group is the universal donor?
O negative (O−) is the universal red blood cell donor — its red cells have no A, B or Rh D antigens, so they can be given to patients of any ABO/Rh group. This makes O− vital in emergencies when a patient's blood type is unknown.
Which blood group is the universal recipient?
AB positive (AB+) is the universal red blood cell recipient — people with AB+ blood can receive red cells from any ABO and Rh group. (Separately, AB is the universal plasma donor.)
Who can O positive donate to?
O positive (O+) can donate red blood cells to all Rh-positive groups: O+, A+, B+ and AB+. O+ people can receive red cells from O+ and O−. O+ is the most common blood group in the world.
Who can receive A positive blood?
A positive (A+) red cells can be given to A+ and AB+ recipients. A+ patients can receive red cells from A+, A−, O+ and O− donors.
What does Rh positive and negative mean?
The Rh (Rhesus) factor is a protein (the D antigen) that may sit on red blood cells. If it's present you're Rh positive (+); if absent, Rh negative (−). Rh-negative patients should generally receive Rh-negative blood, which is why matching both ABO and Rh matters.
Is this blood group compatibility tool free and accurate?
Yes, it's completely free with no sign-up and runs entirely in your browser. The compatibility rules for ABO/Rh red-cell transfusion are standard, but this is an educational reference only — actual transfusions are always confirmed by a laboratory cross-match by medical professionals.
Who can B positive donate to and receive from?
B positive (B+) red cells can be given to B+ and AB+ recipients. B+ patients can receive red cells from B+, B−, O+ and O− donors. It's an educational guide — real transfusions are always confirmed by a lab cross-match.
Why does the Rh factor matter in a transfusion?
An Rh-negative patient can develop antibodies if given Rh-positive blood, which may cause a reaction on a later transfusion, so Rh-negative people should receive Rh-negative red cells. That's why both the ABO group and the Rh (+/−) factor must be matched.
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