title: Early amniocentesis and amniotic fluid AFP levels.
mesh_terms: D000649:Amniocentesis; D005260:Female; D006801:Humans; D011247:Pregnancy / Q000097:blood*; D013997:Time Factors; D000509:alpha-Fetoproteins / Q000097:blood*
chemical_list: D000509:alpha-Fetoproteins