Immunohematology problem.
D000017:ABO Blood-Group System; D000328:Adult; D000372:Agglutination Tests; D001788:Blood Grouping and Crossmatching / Q000379:methods*; D005260:Female; D005312:Fetal Blood / Q000032:analysis; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy
D000017:ABO Blood-Group System