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A letter and a sign naming ABO type and rhesus status.
Also known as: ABO notation, Rhesus status
A blood group is written as an ABO letter and a rhesus sign — A positive, O negative. The rhesus sign refers to the D antigen alone among dozens, which is why a full crossmatch tests for more than the written group states.
Names a blood type by its ABO group and its rhesus status, written as a letter and a plus or minus sign.
Contexts: Medicine
Refers only to the D antigen in its rhesus sign, though the rhesus system has many antigens, which is why the written group does not replace a crossmatch.
Contexts: Medicine
Determines compatibility asymmetrically, so O negative can be given to most recipients while AB positive can receive from most donors.
Contexts: Medicine
One or two capital letters followed by a plus or minus sign, printed on a label or a card.