Non-Stress Test in Pregnancy A non-stress test (NST) checks the health of your baby by looking at your baby’s heartbeat and movement during pregnancy. The test may be used when: • Your baby is not moving as much as usual. • You are near the end of pregnancy or past your due date. • Your pregnancy is high risk. About the Test NST is often given after 28 weeks of pregnancy when your baby is able to respond to the test. • For a high risk pregnancy, the test may be given before 28 weeks. • If admitted to the hospital during your pregnancy, the test may be given 1 to 2 times a day to check the health of your baby.