A Negative (A-)
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Biological Markers: Has A antigen only (No Rh antigen); contains Anti-B antibodies in plasma.
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A- blood donor can give red blood cells to: A+, A-, AB+, and AB- patients.
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A- blood receiver can receive red blood cells from: A- and O- donors.
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Plasma / Platelet Rule: A- donors can give plasma to A and O types, and receive plasma from A and AB types.
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Donor Insight: A- is a critical donor type because it can serve as a universal-leaning red cell source for all A and AB patients.