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How does a non-stress test measure a fetus's heart rate?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Performed in the third trimester, this test monitors the fetus's heart rate as a sign of his health. You'll have a monitor strapped around your waist and your doctor will look for two or more accelerations of 15 beats per minute above the normal baseline, each lasting for 15 seconds or more, during a 20 to 30 minute period. If your baby doesn't move, he could be sleeping. To stimulate him, you will usually be given a sugary or bubbly drink, or the nurse will make a loud noise to try to wake him up. If you pass this test, you typically don't need to move onto the next ones.
YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

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YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.