Negative pregnancy test: could it be a molar pregnancy?
D000293:Adolescent; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood / Q000652:urine; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D006828:Hydatidiform Mole / Q000097:blood / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000652:urine; D011247:Pregnancy; D011258:Pregnancy Tests; D014463:Ultrasonography; D014594:Uterine Neoplasms / Q000097:blood / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000652:urine
D018997:Chorionic Gonadotropin, beta Subunit, Human