India has a special relationship with the B antigen: it is one of the most common blood groups in the country, and demand for it never stops, surgeries, childbirth, cancer care, thalassemia programs. Which makes the negative version of it, B−, one of the most squeezed groups in Indian blood banking: the demand profile of B, with the supply pool of a rarity. ## The numbers, plainly B− shows up in roughly 1 in 90 Indians. Compare the demand side (B+ alone is found in roughly 1 in 3) and you can see the squeeze: families searching for B blood are common, people carrying B− are not. ## What B− blood can do B− red cells carry the B antigen but no Rh (D) antigen. They can be given to four patient groups: - B− patients (like for like)
- B+ patients
- AB− patients
- AB+ patients And the receiving side is narrow, as it is for every negative group: a B− patient can accept red cells only from B− or O− donors. ## The double squeeze For a blood bank, B− is a permanent planning headache: 1. Demand is steady, India’s B+ population needs B-compatible blood every single day; some of those needs can only be met by B− units.
- Supply is thin, roughly 1 in 90 donors, before you subtract the ones who are ineligible, unavailable, or simply never registered. Thin supply plus steady demand is the definition of a standing shortage. It is not a failure of any bank, it is arithmetic that only donor recruitment can change. ## Why B− donors are asked to be regulars One-off heroics do not fix arithmetic. A B− donor who gives every interval (three months between donations) turns a scarce group from “searched for in emergencies” to “planned for in advance.” That is the difference between a family phoning hospitals at 2 AM and a unit already on the shelf. If you are B−, your card is genuinely one of the most-needed in the deck. Two minutes, phone OTP, and the register knows where to find you. Register as a donor → ## Explore Keep going: how blood groups are inherited → · the rare-group register → · all eight groups → · eligibility basics → ## Quick answers about B− Who can B− donate to? B−, B+, AB− and AB+. Who can donate to B− patients? B− and O− only. What percentage of Indians have B−? About about 1,2% of Indians, and fewer in the northeast, where B+ dominates but B− is scarcer than the national average. Is B− rare in India? Yes. In a state full of B+ patients, B− donors are the mismatch that keeps banks awake. What antigens and antibodies does B− have? B antigen, no Rh(D). Plasma carries anti-A antibodies.