title: Pitfalls in early detection of ectopic pregnancy.
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D010535:Laparoscopy; D011247:Pregnancy; D011274:Pregnancy, Tubal / Q000175:diagnosis*; D011869:Radioligand Assay; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin