Mt^a: review and case report

Anti-Mt^a, which recognizes an antigen in the MNS blood group system, was detected during prenatal testing of a para 6, gravida 1 woman with no history of transfusions. Her husband was apparently Mt(a–). Anti-Mt^a was first reported in 1962 as a naturally occurring antibody directed against a new antigen in the MNS system. The last report in the literature of detection of anti-Mt^a was in 1972. Immunohematology 15;2:78–79.