CAS??

A congenital anomaly scan (CAS), sometimes called congenital anatomy scan or 20-week scan, is done in the second trimester, between 18 to 22 weeks. The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) recommends that CAS be performed as part of the routine prenatal care for pregnant all women. The procedure is just a regular 2D or 3D ultrasound, so it's perfectly safe for you and your baby. It aims to check if you're carrying multiples and to rule out 'fetus' growth abnormalities, such as anencephaly (absence of the scan top of the skull), heart defects and bowel obstructions, and congenital malformations, such as cleft lip and spina bifida.