title: Efficiency of human placental lactogen and alpha-fetoprotein measurement in twin pregnancy detection.
mesh_terms: D005260:Female; D006801:Humans; D010928:Placental Lactogen / Q000097:blood*; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D011336:Probability; D014427:Twins; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins; D010928:Placental Lactogen