A nonstress test (NST), also known as fetal heart rate monitoring, is a common prenatal test used to check on a baby's health. During a nonstress test a baby's heart rate is monitored to see how it responds to the baby's movements. The term nonstress refers to the fact that nothing is done to place stress on the fetus during the test.
Typically, a nonstress test is recommended when it's believed that the fetus is at increased risk of death. A nonstress test may be done after 26 to 28 weeks of pregnancy. Certain nonstress test results might indicate that you and your baby need further monitoring, testing or special care.
A nonstress test is a noninvasive test that doesn't pose any physical risks to you or your baby. Find out what a nonstress test involves and whether this prenatal test might benefit you or your baby.
Feb. 23, 2016
- Gabbe SG, et al. Antepartum fetal evaluation. In: Obstetrics: Normal and Problem Pregnancies. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. http://www.clinicalkey.com. Accessed Jan. 15, 2016.
- DeCherney AH, et al. Assessment of at-risk pregnancy. In: Current Diagnosis & Treatment Obstetrics & Gynecology. 11th ed. New York, N.Y.: The McGraw-Hill Companies; 2013. http://www.accessmedicine.com. Accessed Jan. 15, 2016.
- Young BK. Nonstress test and contraction stress test. http://www.uptodate.com/home. Accessed Jan. 15, 2016.
- Frequently asked questions. Pregnancy FAQ098. Special tests for monitoring fetal health. American College of Obstetricians and Gynecologists. http://www.acog.org/Patients/FAQs/Special-Tests-for-Monitoring-Fetal-Health. Accessed Jan. 15, 2016.
- Cunningham FG, et al. Fetal assessment. In: Williams Obstetrics. 24th ed. New York, N.Y.: The McGraw-Hill Companies; 2014. http://www.accessmedicine.com. Accessed Jan. 15, 2016.
- American College of Obstetricians and Gynecologists (ACOG) Committee on Practice Bulletins — Obstetrics. ACOG Practice Bulletin No. 145: Antepartum fetal surveillance. Obstetrics & Gynecology. 2014;124:182.