Screening for Down's syndrome.
D000649:Amniocentesis / Q000009:adverse effects; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D012307:Risk Factors; D000509:alpha-Fetoproteins / Q000032:analysis
D000509:alpha-Fetoproteins