While you are pregnant, you can check the health and development of the baby that you are carrying. These health checks are the NIPT, the 13-week scan and the 20-week scan. This is called prenatal screening. Noninvasive prenatal testing (NIPT) is a blood test to check for chromosomal abnormalities. The 13-week scan and the 20-week scan use an ultrasound to check for physical abnormalities. It is up to you to decide whether to have these tests.