An anomaly scan (also known as 20 weeks scan), also known as a mid-pregnancy scan, takes a close look at your baby. The 20-week scan is offered to everybody. It is to look for the structural abnormality of the fetal organs as blood tests can only tell chromosome abnormalities and not fetal organ abnormalities. These abnormalities can include hole in the heart, abnormal bloodflow in the heart, cleft lip and palate, brain abnormalities amongst others. To the mother, when both chromosomes and fetal abnormality scan tests are normal, in general, they can take it that the baby is normal and growing well till that stage.