An NST (nonstress test) is a monitor that tracks your baby’s heart rate over time and shows if its rate increases when your baby moves around, such as during contractions. An NST may be done if there are concerns regarding decreased fetal movement; alternatively it can also be combined with biophysical profile assessment for optimal results.<\/p>\n
A nonstress test (NST) is a painless ultrasound exam performed during gestation to assess how your baby’s heart rate reacts to movement. The test usually lasts 20-30 minutes but may take up to an hour. You will lie on a reclining chair or exam table and we will place belt-like devices around your uterus with two sensors: one tracking contractions and another monitoring heartbeat rate. We ask you to press a button whenever you sense movement from either your baby or contractions; we then review screens to observe whether it increases and ensure we can clearly hear its heartbeats clearly on screen!<\/p>\n
At times, we may use a buzzer or noisemaker to awaken your baby for an NST exam. This won’t hurt them but may encourage more activity and movement from them. A snack or sugary beverage during an NST may be especially useful in encouraging them to kick and move around more actively.<\/p>\n
At an NST, we will look for accelerations in fetal heart rate (known as “fetometry” score) which occur with movement. These accelerations indicate that your baby’s heart is responding similarly to when exercising: its heartbeat speeds up during movement just like our own does!<\/p>\n
A non-stress test (NST) can tell us whether your baby’s heart rate increases with movement and whether or not its getting enough oxygen. It also allows healthcare providers to determine whether more tests should be completed, or induce labor to bring your newborn into this world sooner.<\/p>\n
If your baby’s heart rate doesn’t respond to movement during an NST or NSR test, this is known as nonreactive NST\/NSR testing. While this doesn’t indicate anything wrong per se, your healthcare provider may suggest additional tests, like biophysical profiles and amniotic fluid index tests (AFI), or recommend another means of inducing labor such as taking medications.<\/p>\n
If your NSR results are abnormal, it’s essential that you notify your healthcare provider as soon as possible in order to discuss what this could mean for you and your baby. An abnormal NSR could indicate that your fetus isn’t getting enough oxygen and may need to be born sooner than anticipated.<\/p>\n
A nonstress test (NST) will take place at your doctor’s office. You will lie on a padded exam table, while two elastic belts with sensors will be wrapped around your abdomen to record both Doppler ultrasound (reflecting sound waves back off your baby) and contraction monitoring uterine contractions and fetal movements. Usually lasting 20-40 minutes, you will be asked to push a button each time you feel your baby move or have contractions; your obstetrician will quickly interpret results of NST easily and efficiently.<\/p>\n
Before taking an incontinence test, it is necessary to empty your bladder completely and wear comfortable clothes. A light meal or snack might be beneficial in stimulating fetal movements. Also avoid smoking, caffeine and alcohol before the test as these could compromise its results.<\/p>\n
If your baby moves frequently and the fetal heart rate rises during the NST, this indicates a reactive result; meaning that their oxygen supply is adequate and everything appears to be normal.<\/p>\n
Obstetricians sometimes use an NST to assess your baby’s activity if you are having a high-risk pregnancy or are showing decreased fetal movement – this could indicate that the fetus isn’t developing as expected or is having complications such as being Rh negative.<\/p>\n
An NST can assist your obstetrician in determining if further testing, such as biophysical profiles or ultrasound scans are necessary for you and your baby’s wellbeing. It does not involve radiation exposure or other potentially hazardous procedures.<\/p>\n
Your obstetrician will review your NST results after it has been completed and explain whether they were reactive or nonreactive, neither implying anything is amiss but can provide helpful information to the obstetrician such as knowing there wasn’t any movement recorded during an NST test. They might use noisemakers or buzzers during subsequent exams in an effort to wake the baby, or may suggest additional tests or biophysical profiles to gain more information.<\/p>\n
A nonstress test (NST) is an easy and noninvasive way to assess how well your baby is faring during gestation. Conducted at your doctor’s office or perinatal center, during an NST you will lie back on a comfortable chair while monitors are attached to your belly – these monitors measure the fetal heart rate as well as any contractions you might be having and track contractions; additionally the NST looks for evidence that its heart rate increases when your baby moves or kicks, which indicates it’s getting enough oxygen.<\/p>\n
When performing an NST that is reactive, the heart rate of your unborn fetus accelerates two or more times within twenty minutes and your provider considers this reassuring. Nonreactive NSTs may still be performed as many babies sleep or don’t wake easily during this type of test – should this occur, further testing may need to take place by your health care provider in order to detect if there are any issues with your unborn baby.<\/p>\n
Your healthcare provider might recommend conducting a biophysical profile test that combines an NST, ultrasound and blood pressure cuff. They might also perform a contraction stress test where medication will make your uterus contract, but not start labor; the results from these tests can help them assess if your fetus is healthy and receiving enough oxygen.<\/p>\n
If your NST test results in an increase of heart beat when moving or when contracting, this indicates a healthy fetus. If it does not increase in response to movement or contractions, however, this indicates something may be amiss with either you or the fetus; or there may not be enough oxygen reaching them both; depending on how far along you are in pregnancy as well as results of other tests taken during your gestation period and tests completed this may require closer monitoring or even inducing labor depending on individual situations – both you and healthcare provider will together decide the best plan possible in terms of how best approach to take in each situation.<\/p>\n
If the heart rate increases on an NST two times during a 20-minute test period, that result can be considered reactive (reassuring). If movements can also be detected via ultrasound imaging, then it is highly likely that your baby is doing well.<\/p>\n
If your baby’s heart rate does not increase during the NST or does not show enough accelerations within 20 minutes of testing, these results are considered nonreactive. While it does not necessarily indicate anything is amiss, more tests or close monitoring may be needed to ensure his\/her safety.<\/p>\n
Your healthcare provider may perform an additional biophysical profile or contraction stress test similar to an NST, which assesses your uterus and baby’s movements, muscle tone and amniotic fluid level. As part of these tests, they may rub your nipples or administer medicine that causes your uterus to contract and monitor how this impacts on their heart rate and duration – not painful and without risk for unborn child!<\/p>\n
Your healthcare provider may attempt to wake your fetus during an NST by using a buzzer or noisemaker as an alarm clock-style buzzer or noisemaker on your belly, similar to how an alarm clock works. They may ask you to drink water or snack, which could help your baby move around more freely, while using another small device with soundwaves similar to how vibrators works on cell phones can also help.<\/p>\n
If the fetus’s heart rate does not increase during tracing or shows many late decelerations (sudden drops in its rate), an NST is unlikely to be responsive and your healthcare provider may suggest more monitoring or delivery, perhaps anywhere from 24 weeks up to 38 weeks, depending on circumstances and your baby’s health.<\/p>\n