AABB Standards 28th ed. Standard 5.14 RBC ABO/Rh compatibility from caller-assigned recipient and unit ABO (o, a, b, ab) and RhD (positive, negative). Group O RBCs to O/A/B/AB; A to A/AB; B to B/AB; AB to AB. RhD-negative units to either RhD; RhD-positive units only to RhD-positive recipients. Not a transfusion order. magent does not type blood. Does not encode emergency RhD-positive-to-negative exceptions, plasma, or platelets.

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