We are not a blood bank. We connect people who need blood with people who can give it.

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Assam Blood Donor
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B−

The B− blood group.

roughly 1 in 90 of people in India, a rare group.

Rare in Assam's banks, B− patients depend on a small pool of registered donors.

Register as a B− donor Can I donate?

0 active B− donors on the Assam register right now · Need B− blood? start a request →

B− can donate to

O+O−A+A−B+B−AB+AB−

B− can receive from

O+O−A+A−B+B−AB+AB−
How this works in real hospitals.Compatibility above is for red cells, simplified. In practice the blood centre runs a crossmatch before every transfusion, and plasma/platelet rules differ. Final decisions always belong to the treating centre, never self-arrange a match.

B− is rare, the register needs you specifically.

Register once; we contact you only when a compatible patient near you needs blood.

Register as a B− donor
Who can B− blood be given to?

B− red cells can go to patients with: B−, B+, AB−, AB+. Compatibility is decided by the blood centre's crossmatch, never self-match.

Who can donate to an B− patient?

B− patients can receive red cells from: B−, O−.

Is B− a rare blood group?

B− is rare in India, roughly 1 in 90 of the population. Rare-group patients depend heavily on voluntary registers like ours.