Hematocrit among blacks with sickle cell trait.
D000293:Adolescent; D000328:Adult; D000755:Anemia, Sickle Cell / Q000097:blood*; D044383:Black People; D002648:Child; D002675:Child, Preschool; D005260:Female; D006400:Hematocrit; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D012805:Sickle Cell Trait / Q000097:blood*