ECTOPIC PREGNANCY

A   28-year-old woman   visits  the emergency   department  complaining of

unilateral  left-sided  abdominal   pain    and vaginal spotting    of  3   days’

duration.   Her last    menstrual   period  was 8   weeks   ago,    and before  this

episode she had menses  every   28  days.   Her only    previous    pregnancy   was an

uncomplicated   term    spontaneous vaginal delivery.   She had used    intrauterine

contraception   for 3   years   in  the past.   On  pelvic  examination the uterus  is

slightly    enlarged,   and there   is  left    adnexal tenderness  but no  palpable    mass.

Quantitative    serum   β-hCG   value   is  2,600   mIU.