Fetal erythrocytes in the maternal circulation.
D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D000740:Anemia; D005260:Female; D005315:Fetal Diseases; D005331:Fetomaternal Transfusion; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases; D008423:Maternal Age; D010298:Parity; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System