STS
The second trimester scan is also called a genetic scan which checks for chromosomal markers, structural abnormalities of the baby, and at the same time, a detailed evaluation of the fetal heart is carried out. This is done at 20-23 weeks. It allows a more thorough evaluation of the fetal development because the organs, such as the fetal brain and heart, are more visible and more developed than at the time of the first tirmester scan. Attached is a sample report.