Sonographic Features
It is easiest to evaluate the placental cord insertion in the latter part of the first and in the second trimester.
In order to confirm that the cord insertion has been identified, the following techniques may be employed:
1. When the examiner taps on the maternal abdomen over the apparent cord insertion site, it will appear ”fixed”.
2. Color Doppler is helpful in locating the cord insertion and identifying the vessels that extend from the cord insertion into the placenta.