title: RRA versus RIA methodology.
mesh_terms: D006063:Chorionic Gonadotropin / Q000652:urine; D005260:Female; D006801:Humans; D011247:Pregnancy; D011258:Pregnancy Tests; D011259:Pregnancy Tests, Immunologic; D011271:Pregnancy, Ectopic / Q000175:diagnosis; D011863:Radioimmunoassay; D011869:Radioligand Assay
chemical_list: D006063:Chorionic Gonadotropin