title: The value of placental localization prior to amniocentesis.
mesh_terms: D000650:Amnion; D000653:Amniotic Fluid; D002859:Chromium Isotopes; D004912:Erythrocytes; D005260:Female; D005331:Fetomaternal Transfusion / Q000517:prevention & control*; D006801:Humans; D008431:Maternal-Fetal Exchange; D010920:Placenta; D011247:Pregnancy; D011677:Punctures; D011877:Radionuclide Imaging; D012204:Rh-Hr Blood-Group System
chemical_list: D002859:Chromium Isotopes; D012204:Rh-Hr Blood-Group System