Vit. B12:  correlation of serum concentrations and pregnancy.
D001769:Blood; D045728:Corrinoids; D005260:Female; D006397:Hematinics; D006801:Humans; D011247:Pregnancy / Q000097:blood; D014805:Vitamin B 12 / Q000097:blood*; D014803:Vitamin B Complex
D045728:Corrinoids; D006397:Hematinics; D014803:Vitamin B Complex; D014805:Vitamin B 12
BLOOD; PREGNANCY/blood in; VITAMIN B12/in blood