A Safe Method to Monitor Your Baby’s Well-Being Through Heartbeat Observation
What Is an NST?
The Non-Stress Test (NST) is a commonly used prenatal test that simultaneously monitors your baby’s heartbeat and your uterine contractions. Its purpose is to assess whether your baby is receiving enough oxygen and to observe whether the baby’s heart rate appropriately increases with movements — a sign of healthy responsiveness.
Typically, NST is performed after the 34th week of pregnancy, but it can also be recommended earlier if there are specific risk factors such as reduced fetal movement, growth restriction, diabetes, or hypertension.
How Is the Test Performed?
During the procedure, the expectant mother lies comfortably on a bed while two small sensors are placed on her abdomen —
- one records the baby’s heartbeat,
- the other tracks uterine contractions.
A small button device is placed in the mother’s hand; she presses it each time she feels the baby move. This allows the system to correlate the baby’s movements with heart-rate changes.
The test usually takes 20–30 minutes. It is best performed when the baby is active and awake, so a light snack before the session is often recommended. If the baby is sleeping, the test may take longer or be repeated later.
How Are the Results Interpreted?
- Reactive NST: The baby’s heart rate accelerates appropriately with movements — a reassuring sign that the baby is well-oxygenated and healthy.
- Non-Reactive NST: The expected heart-rate acceleration is absent. In this case, the test may be extended, repeated, or followed by more advanced fetal assessments.
A reactive NST result generally indicates that the baby is doing well for the next 48–72 hours, but it represents only the baby’s current condition. Therefore, regular monitoring remains essential.
When Is NST Performed More Frequently?
NST may be scheduled earlier or more often in the following circumstances:
- Maternal conditions such as diabetes, hypertension, or thyroid disorders
- Decreased fetal movements
- Fetal growth restriction (IUGR)
- Previous pregnancy complications (stillbirth, preterm birth)
- Abnormal amniotic fluid levels (too little or too much)
- Post-term pregnancy (beyond 40 weeks)
What Should You Know?
NST is safe, painless, and non-invasive for both mother and baby.
However, it must always be interpreted by an experienced obstetrician, as results can sometimes be misleading and should be evaluated alongside other clinical findings.
As you approach birth, one of the clearest signs of your baby’s health and safety inside the womb is the rhythm of the heartbeat.
The NST is the scientific and reliable way to listen to that sound of reassurance.
Contact us to schedule your NST appointment and ensure your baby’s well-being every step of the way.
