Evaluating the Transvaginal Ultrasound Diagnostic Criteria for Abnormal First-Trimester Pregnancy With Follow-Up Into the Third Trimester and Validation of Results

OBJECTIVE: To evaluate the current ultrasound diagnostic criteria for non-viable pregnancy in the first trimester. METHODS: We conducted a retrospective chart review involving 3 tertiary care institutions. Consecutive first-trimester ultrasound reports between January 2013 and June 2016 were reviewed. All first-trimester ultrasound examinations performed to assess pregnancy viability with adequate imaging or clinical follow-up were included. …