UTERINE BLEEDING from a GESTATION of less than 20 weeks without any CERVICAL DILATATION. It is characterized by vaginal bleeding, lower back discomfort, or midline pelvic cramping and a risk factor for MISCARRIAGE.

Synonyms: Threatened Miscarriages, Threatened Abortion, Threatened Miscarriage, Abortion, Threatened, Threatened Abortions, Miscarriage, Threatened