Recurrent Miscarriage

A 32-year-old woman presents for evaluation after three consecutive miscarriages. Before these miscarriages, she had one successful pregnancy. The patient reports no medical problems or previous surgeries. In her first miscarriage, uterine bleeding and cramping started in the 7th week of gestation, and an ultrasonographic evaluation showed an empty gestational sac of 6 weeks' size. In her next pregnancy, she presented with a miscarriage in the 8th week. The third miscarriage was identified by ultrasonographic testing as a dead embryo measuring 7.5 weeks' size. How should her case be evaluated and managed?