title: Improved accuracy in the clinical diagnosis of ectopic pregnancy by the simultaneous use of pelvic ultrasonography and a radioreceptor assay of human chorionic gonadotropin.
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000175:diagnosis* / Q000652:urine; D011869:Radioligand Assay; D014463:Ultrasonography
chemical_list: D006063:Chorionic Gonadotropin