Routine first-trimester ultrasound screening using a standardized anatomical protocol
First-trimester ultrasound scans were introduced to China for nearly 20 years. We aimed to determine the performance of routine first- Trimester scans using a standardized Anatomic protocol. Scans at 11 to 13+6 weeks were performed in a single center during a 7-year span. During the first trimester, 37.7% of cardiac defects were identified. This included 57.9% of major cardiac defects and 2.6% of mild cardiac defects.