No, A+ red cells cannot be given to O+ patients. The ABO/Rh rules block it, and the crossmatch would reject the unit anyway. ## Why not O+ patients’s plasma carries antibodies that would attack A+ red cells. A mismatched unit clumps inside the patient, the exact danger compatibility rules exist to prevent. ## What O+ patients CAN receive O+ patients can receive red cells from: O−, O+. ## What A+ donors can do instead Your red cells still help: A+, 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 A+ donate blood to O+?
No, A+ red cells cannot go to O+ patients. Which groups O+ can receive from, and what A+ donors can do instead.
People also ask
Can A+ donate blood to O+?
No, O+ patients can only receive from O−, O+.
Is A+ to O+ 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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Reading is step one. Registering is step two.
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