title: First trimester alpha-fetoprotein levels and fetal chromosomal aneuploidies.
mesh_terms: D000328:Adult; D000782:Aneuploidy; D002869:Chromosome Aberrations / Q000097:blood*; D025063:Chromosome Disorders; D002891:Chromosomes, Human, Pair 21; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012016:Reference Values; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins