title: Midtrimester amniotic fluid delta optical density at 450 nm in normal pregnancies.
abstract: Spectrophotometric analysis of amniotic fluid has become the standard for assessing the fetal condition in Rh-immunized pregnancies. Serial amniocentesis is usually started at 28 to 29 weeks of gestation unless the antibody titer or history indicates it should be done earlier. This study presents the values from 14 to 20 weeks in normal pregnancies, which will also assist in evaluating pathologically elevated values.
mesh_terms: D000328:Adult; D000653:Amniotic Fluid / Q000032:analysis*; D001663:Bilirubin / Q000032:analysis*; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012016:Reference Values; D012204:Rh-Hr Blood-Group System; D013053:Spectrophotometry; D013223:Statistics as Topic
chemical_list: D012204:Rh-Hr Blood-Group System; D001663:Bilirubin