The O− blood group.
well under 1 in 30 of people in India, a rare group.
The universal donor: every patient can take O− red cells, but only O− donors can give to O− patients. The group every blood bank runs short of first.
0 active O− donors on the Assam register right now · Need O− blood? start a request →
O− can donate to
O− can receive from
O− is rare, the register needs you specifically.
Register once; we contact you only when a compatible patient near you needs blood.
Register as a O− donorWho can O− blood be given to?
O− red cells can go to patients with: O−, O+, A−, A+, B−, B+, AB−, AB+. Compatibility is decided by the blood centre's crossmatch, never self-match.
Who can donate to an O− patient?
O− patients can receive red cells from: O−.
Is O− a rare blood group?
O− is rare in India, well under 1 in 30 of the population. Rare-group patients depend heavily on voluntary registers like ours.
Can O− donors give plasma and platelets too?
Plasma and platelet compatibility follows different (partly inverted) rules from red cells: AB plasma is universal, O plasma only suits O patients. The blood centre decides what is drawn and who it matches.
Why does the register ask for my blood group?
So patients' families never get pings that can't help: requests reach only compatible donors near them. Don't know your group? Register as “not sure”, camps and centres test it free.
More about O− and donating