Sometimes, we need to test the health of your unborn baby. The Prenatal Diagnosis Center offers the following tests: Show
Non-stress TestWe use a machine known as a fetal monitor to do a non-stress test. A non-stress test (NST) looks at your baby's heart rate over time (usually 20 to 30 minutes, but sometimes up to an hour). The monitor has two sensors that are placed on your belly with two belts that go around your waist. One sensor detects any contractions you may be having, even those you might not feel. The other sensor tracks your baby's heart rate, which you can hear. The information is displayed on graph on paper or on a computer screen. During the test, you'll be comfortable in a reclining chair. One of our nurses will watch the heart rate during the test to see how your baby is doing and make sure the heart rate increases when your baby moves.
Biophysical Profile and Amniotic Fluid IndexA biophysical profile (BPP) is an ultrasound exam that monitors the movement, body tone and breathing efforts of your baby. Each of these four measurements is given a score of zero or two points, and the scores are added up. If the BPP is used with a NST and the NST was "reactive," another two points is added.
The amniotic fluid index (AFI) is an ultrasound exam that measures the amount of amniotic fluid around your baby. We may need to measure the pockets of amniotic fluid for several reasons. Perhaps you are past your due date or you have a history of water breaking too early in a pregnancy. The BPP and AFI testing takes approximately one hour and is not uncomfortable. Reviewed by Dan Brennan, MD on August 09, 2022 The nonstress test (NST) is a simple, noninvasive way of checking on your
baby's health. The test, sometimes called a cardiotocography, records your baby's movement, heartbeat, and contractions. It notes changes in heart rhythm when your baby goes from resting to moving, or during
contractions if you're in labor. Your baby's heart should beat faster when active -- just like yours. The NST can reassure you that your baby is healthy and getting enough oxygen. It's called a nonstress test because the test won’t bother your baby. Your doctor won't use medications to make your baby move. The NST records what your baby is doing naturally. NST is a common test for pregnant women. Your doctor may use it to check the health of your baby after weeks 26 to 28 of pregnancy. Certain results may mean your doctor needs to monitor your baby, do more tests, or schedule delivery. You may need an NST if: The NST
is safe for you and your baby. Your doctor will take your blood pressure before the test. Then, you'll lie down with two belts around your belly. One measures your baby's heartbeat and the other measures contractions. (If you’re carrying twins, you’ll have two belts to check their heartbeats.) Your doctor will check your blood pressure from time to time while they test your baby. When you feel the baby kick or move, you may press a button so your doctor can see how the baby's heartbeat changed while moving. The test will take about 20 minutes. If your baby seems to be sleeping, a nurse may try to wake up your baby by ringing a bell, moving your belly, or by using an acoustic stimulator. A normal NST shows that your baby is getting enough oxygen and is doing well. If the results are unusual, your doctor may suggest further testing. You can get one of two results from an NST: Reactive: This result means that your baby’s heart rate went up to the expected level at least twice during the test. Nonreactive: This means your baby’s heart rate didn’t rise as much as expected during the test. It doesn't necessarily mean there’s a problem. You can get this result if your baby is asleep. If your test is nonreactive your doctor may do other tests. If your baby doesn't move during the NST, try not to worry. Many women with nonreactive results turn out to have perfectly healthy babies. Sometimes, babies sleep through the whole thing. The test is not checking "movement," but evaluating reactivity of the heartbeat. There may or may not be appreciable movement during the test. How Often You Will Need a Nonstress TestYou might start getting weekly or twice weekly nonstress testing after 28 weeks if you have a high-risk pregnancy. (Before 28 weeks, the test isn't accurate.) You may only need one isolated NST if the baby is not moving well. You may need the test more often depending on your situation. Ask your doctor. Tests Similar to a Nonstress TestA test similar to the NST is the contraction stress test. Your doctor may suggest you have this test if you are 34 weeks or more pregnant, and you’ve had a nonreactive result with a NST. Which results after 20 minutes of a nonstress test is suggestive of fetal reactivity?At week 32 of pregnancy or later, if your baby's heartbeat accelerates to a certain level above the baseline twice or more for at least 15 seconds each within a 20-minute window, the results are considered reactive.
What is a reactive NST?Nonstress test results are given as one of the following: Reactive or Reassuring. This means the baby's heart rate increased two or more times during the testing period. Nonreactive. This means the baby's heartbeat didn't increase when moving, or the baby wasn't moving much.
What do accelerations indicate during an NST?Accelerations are short-term rises in the heart rate of at least 15 beats per minute, lasting at least 15 seconds. Accelerations are normal and healthy. They tell the doctor that the baby has an adequate oxygen supply, which is critical.
What happens during a non stress test?What Happens During a Nonstress Test? You'll wear two monitors (one tracks the baby's heartbeat and movement, and the other records contractions) while lying on your left side. A technician monitors the fetal heart rate during each movement on a screen while your contractions are recorded on paper.
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Which result after 20 minutes of a nonstress test is suggestive of fetal reactivity?
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