title: Letter: Prospective diagnosis of spina bifida.
mesh_terms: D000328:Adult; D000510:Alpha-Globulins / Q000032:analysis; D000653:Amniotic Fluid / Q000032:analysis; D001800:Blood Specimen Collection; D005260:Female; D005326:Fetal Proteins / Q000032:analysis; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011863:Radioimmunoassay; D016135:Spinal Dysraphism / Q000175:diagnosis*
chemical_list: D000510:Alpha-Globulins; D005326:Fetal Proteins