An anomaly scan, also known as a mid-pregnancy scan, is an ultrasound scan performed between the 18th and 21st weeks of pregnancy to examine the baby and the womb (uterus) more closely and determine where the placenta is located.
The goal of the scan is to find any serious physical abnormalities in the developing infant. The scan can be used as a dating scan, in which a black and white 2-dimensional (2-D) image of the baby in the womb is obtained. At 20 weeks, this image reveals the baby's face and hands, giving the healthcare professional (a sonographer) a sense of what's going on within. This is absolutely thrilling!