title: Aberrant results of serum beta-human chorionic gonadotropin assays: an infrequent but vexing problem.
mesh_terms: D006063:Chorionic Gonadotropin / Q000032:analysis*; D003951:Diagnostic Errors; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000175:diagnosis* / Q000378:metabolism
chemical_list: D006063:Chorionic Gonadotropin