title: Commentary on "Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy". Kadar N, DeVore G, Romero R. Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy. Obstet Gynecol 1981;58:156-61.
authors.forename: Roy M
authors.initials: RM
authors.lastname: Pitkin
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000097:blood* / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal
chemical_list: D006063:Chorionic Gonadotropin