Maternal serum AFP screening.
D000757:Anencephaly / Q000175:diagnosis; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011863:Radioimmunoassay; D016136:Spina Bifida Occulta / Q000175:diagnosis; D000509:alpha-Fetoproteins / Q000032:analysis*
D000509:alpha-Fetoproteins