O Negative (O-)
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Biological Markers: Has no A, B, or Rh antigens on red blood cells; contains Anti-A and Anti-B antibodies in plasma.
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O- blood donor can give red blood cells to: All blood types (Universal Red Cell Donor).
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O- blood receiver can receive red blood cells from: O- donors only.
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Plasma / Platelet Rule: O- donors can give plasma to O types only, but can receive plasma from all blood types (Universal Plasma Recipient).
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Donor Insight: O- red blood cells are used in emergencies when a patient's blood type cannot be ******d in time.