People with type O blood are considered universal donors because their blood has Rh antigen on their red blood cells.

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People with type O blood are considered universal donors because they do not have A or B antigens on their red blood cells, making it less likely for their blood to react with the recipient's immune system. However, whether or not they have Rh antigens on their red blood cells depends on their individual Rh factor, which can be positive or negative. Therefore, not all people with type O blood have Rh antigens, and being Rh positive or negative does not affect their status as universal donors.

People with Type O Blood Are Considered Universal Donors Because