Low maternal serum alpha-fetoprotein and Down syndrome.
D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic / Q000097:blood*; D011296:Prenatal Diagnosis; D000509:alpha-Fetoproteins / Q000172:deficiency*
D000509:alpha-Fetoproteins