A non-stress test (or NST) is a simple and painless way to check on the well being of your baby.
What happens during the test?
This test is usually done in the doctor's office.
You will be lying down for the test.
You will have 2 belts strapped around your abdomen. One is used to measure the baby's heartbeat and the other one checks for contractions. These two belts will be attached to a fetal monitor.
The test usually takes 20-30 minutes, but can take longer depending on how active your baby is or if you are carrying more than one baby.
What should the test results show?
An NST is "reactive" if the baby's heartbeat is in the range of 120-160 beats per minute. The baby's heartbeat should increase in response to movement. If you are less than 36 weeks pregnant, there should be no contractions.
If your NST is "not reactive" don't panic. Usually there is nothing wrong with the baby. An ultrasound can be done to be sure your baby is doing okay.
Why do I need an NST?
NST's are done to check and see if your baby is doing well and is strong enough for delivery. Some of the most common reasons for an NST are:
Decreased movement of the baby or no movement of the baby
Gestational diabetes or diabetes before pregnancy
More than one baby (twins, triplets)
High blood pressure
Pre-eclampsia
Preterm labor or a history of preterm delivery
Being over-due (pregnancy that is lasting longer than 40 weeks)
Mom over the age of 35 years
Abnormal laboratory tests (such as an abnormal AFP)
Thyroid problems
If you have any questions about your NST or why an NST has been ordered, discuss this with your doctor.
