The clinical significance of low maternal serum alpha-fetoprotein in obstetric practice.
D005260:Female; D006801:Humans; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography; D000509:alpha-Fetoproteins / Q000032:analysis*
D000509:alpha-Fetoproteins