title: Alpha-fetoprotein levels and yolk sac size in the first trimester of pregnancy.
abstract: Transvaginal ultrasound measurement of the yolk sac and transvaginal amniocentesis were carried out on 94 women prior to first-trimester termination of pregnancy. Maternal serum and fluids from the amniotic cavity and extraembryonic coelom were analysed for alpha-fetoprotein (AFP). No correlation was found between the yolk sac size and the levels of AFP in any of these sites.
mesh_terms: D000649:Amniocentesis; D000653:Amniotic Fluid / Q000737:chemistry*; D005260:Female; D006801:Humans; D011247:Pregnancy / Q000097:blood*; D011261:Pregnancy Trimester, First; D015017:Yolk Sac / Q000033:anatomy & histology*; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins