21 CFR § 606.151 - Compatibility testing.
(a) A method of collecting and identifying the blood samples of recipients to ensure positive identification.
(b) The use of fresh recipient serum or plasma samples less than 3 days old for all pretransfusion testing if the recipient has been pregnant or transfused within the previous 3 months.
(c) Procedures to demonstrate incompatibility between the donor's cell type and the recipient's serum or plasma type.
(d) A provision that, if the unit of donor's blood has not been screened by a method that will demonstrate agglutinating, coating and hemolytic antibodies, the recipient's cells shall be tested with the donor's serum (minor crossmatch) by a method that will so demonstrate.
(e) Procedures to expedite transfusion in life-threatening emergencies. Records of all such incidents shall be maintained, including complete documentation justifying the emergency action, which shall be signed by a physician.