Outcome predictors of success may help to streamline the medical abortion process. As one of the Population Council mifepristone trial sites in 1994, we gathered ultrasound images prior to discharge from the clinic on Day 3 (same day as misoprostol dosing). This study was designed to determine if Day 3 ultrasound findings predict final outcome in medical abortions up to 63 days gestation using the FDA approved dosing protocol. Enrolled patients underwent medical termination of gestations up to 63 days with 600 mg of mifepristone (Mifeprex), followed in 48 h by 400 mg of oral misoprostol (Cytotec) w1x. Patients received their misoprostol in the clinic and were observed for at least 4 h. Ultrasounds were performed just prior to discharge from the clinic on Day 3. Successful medical abortion was defined as complete expulsion of the pregnancy with no suction curettage (DyC). Failure was defined as the need for suction curettage for any indication. A total of 178 women with gestations of up to 63 days were enrolled in Portland, Oregon. Six patients were lost to follow-up and seven patients