Fetal echocardiography is a test similar to an ultrasound. This exam allows your doctor to better see the structure and function of your unborn child’s heart. It’s typically done in the second trimester, between weeks 18 to 24.

The exam uses sound waves that “echo” off of the structures of the fetus’ heart. A machine analyzes these sound waves and creates a picture, or echocardiogram, of their heart’s interior. This image provides information on how your baby’s heart has formed and whether it’s working properly.

It also allows your doctor to see the blood flow through their heart. This in-depth look allows your doctor to find any defects or abnormalities in the baby’s blood flow or heartbeat.