A Non-Stress Test (NST) is a simple and safe procedure used during pregnancy to monitor a baby's heart rate. It helps healthcare providers assess how well the baby is doing by checking the heart rate in response to movements. The test typically involves placing sensors on the mother's abdomen to track the baby's heartbeat over a period of time, usually 20 to 40 minutes. NSTs are often performed in the third trimester, especially for women with high-risk pregnancies or concerns about the baby's health. The results can indicate whether the baby is getting enough oxygen and if further testing or interventions are needed.