No, AB+ red cells cannot be given to AB− patients. The ABO/Rh rules block it, and the crossmatch would reject the unit anyway. ## Why not AB− patients carry both A and B antigens and can only accept blood carrying no unexpected antigens, red cells that match their own strict set. A mismatched unit clumps inside the patient, the exact danger compatibility rules exist to prevent. ## What AB− patients CAN receive AB− patients can receive red cells from: O−, A−, B−, AB−. ## What AB+ donors can do instead Your red cells still help: AB+, that is real, needed work. Register and let a compatible patient near you find you when the call comes. Plasma rules also run opposite to red cells (explained here).
Compatibility
Can AB+ donate blood to AB−?
No, AB+ red cells cannot go to AB− patients. Which groups AB− can receive from, and what AB+ donors can do instead.
People also ask
Can AB+ donate blood to AB−?
No, AB− patients can only receive from O−, A−, B−, AB−.
Is AB+ to AB− safe in emergencies?
No, emergencies make compatibility matter more, not less; unknown-group patients get O−.
Where is this decided?
The blood bank crossmatch (see the crossmatch guide), never self-matched at home.
About this article
Written by Assam Blood Donor team. Medical review: pending, content follows published national (NBTC/NACO) guidance and is for general education, not personal medical advice. Last updated 11 Sept 2026.
Sources: NBTC donor selection criteria · standard donation-centre practice
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