When you go to the doctor during pregnancy, they put a little device on your stomach and listen to the baby's heartbeat, right? Sometimes they put a belt around your stomach and check. What does this actually do? Why is this so important? What can this tell you about your baby? Let's talk about this simply.
What is Fetal Heart Rate Monitoring?
Simply put, Fetal Heart Rate Monitoring is a method of checking how fast and how rhythmically your baby's heartbeat is. When you're pregnant, your doctor wants to make sure your baby is healthy and growing well. One of the main methods used to do this is to check the baby's heart rate and rhythm.
This test is often done late in pregnancy and during labor. This test may be done in conjunction with other tests to get a more in-depth look at your baby's condition, especially if you have a health risk factor such as diabetes or high blood pressure.
Why do doctors say they need to do this test?
This test is often recommended if your pregnancy is at high-risk. For example:
- If you have diabetes.
- If you are using preterm labor medicine.
- If the doctor thinks that the baby's growth or development is not normal.
In addition to this, the doctor may refer to this test to confirm whether the baby is doing well during delivery, or if they want to check the baby's heartbeat for any other reason.
What are the methods for conducting this test?
There are two main ways to monitor your baby's heartbeat. One is by doing it externally , on your belly. The other is by doing it internally , after your waters break and labor begins.
1. External Monitoring
This is the most common method. This is also done in two ways.
- Auscultation: If your pregnancy is going well and without any complications, your doctor will use a special stethoscope (`fetoscope`) or a small hand-held device (` Doppler ultrasound` ) to periodically check the baby's heartbeat. This is very simple.
- Electronic monitoring: Sometimes, especially after 32 weeks, your doctor may do a test called a ``Nonstress Test.'' This involves counting how many times your baby's heart rate increases over a 20-minute period. A belt with an electronic sensor is worn around your abdomen. It continuously records your baby's heart rate. You can also wear a belt like this during labor. It can check if your baby is putting any pressure on his or her uterus due to contractions. If there is any pressure, you may need to deliver the baby as soon as possible.
2. Internal Monitoring
This is only done after labor has begun, your waters have broken, and your cervix has opened.
In this, the doctor inserts a thin wire called an electrode through your vagina and gently presses it against the baby's scalp. This can give much more accurate results than doing it externally.
Doppler and Fetoscope: What's the difference?
Many people are a little confused about these two devices. Let's clear that up.
| Device | How it works | What to know |
|---|---|---|
| Fetoscope | This is a special stethoscope shaped like a trumpet. When placed on the belly, you can hear the baby's heartbeat directly. No machine or batteries are needed. | This doesn't emit anything like sound waves, but it takes experience to accurately detect a heartbeat. |
| Doppler Ultrasound | This uses sound waves to capture the sound of the baby's heart valves moving. That's what we hear. | It is safe under medical supervision. But doctors warn against using it at home. Without training, there is a risk of misinterpreting what you hear, becoming unnecessarily scared, or avoiding it when there is a problem. |
Is it good to use these devices at home?
Some people buy ``at-home fetal doppler`` devices that they can use at home. But doctors don't think this is a good idea. The reason is that if an untrained person uses it:
- It can be unfounded to worry that you haven't heard the baby's heartbeat (especially in the early weeks of pregnancy).
- You may not be able to tell exactly whether you are hearing the baby's heartbeat or the sound of your own large blood vessel.
- When there is a problem, it is possible to fail to recognize it and receive the wrong certificate .
Therefore, never use a device like this at home without talking to your doctor .
Are there any risks with these tests?
- External monitoring is virtually risk-free. It will not harm you or your baby. You may feel a little discomfort from the belt that is worn around your belly.
- Internal monitoring may have some very minor risks.
- Feeling some discomfort.
- Very rarely, an infection occurs.
- A small scratch or bruise on the skin of the baby's head.
Important: If you are HIV-positive, internal monitoring is not done because it increases the risk of passing the infection to your baby.
What do the results say?
A healthy baby's heart rate is usually between 110 and 160 beats per minute . This rate increases slightly when the baby is moving, which is a good sign.
Signs that there may be a problem are:
- Heart rate less than 110 beats per minute.
- Speed exceeding 160 beats per minute.
- Showing abnormal changes in the heartbeat pattern.
- The heart rate does not increase even when the baby moves or the uterus contracts.
But remember, just because something like this is happening doesn't mean the baby has a serious problem. It's just a sign that the baby may not be getting the oxygen they need. The doctor will investigate further.
Sometimes, factors such as your body weight, the position of you or your baby, or the presence of too much amniotic fluid in the uterus can affect the accuracy of the results.
What to do if the heartbeat is abnormal?
If the doctor notices any abnormalities in the baby's heartbeat, they may do the following:
- You are asked to change position (e.g. turn left).
- Fluids are given to the body through an IV ( saline ).
- You are being given extra oxygen.
- Medication is given to slow down uterine contractions.
If the baby's heartbeat does not return to normal after these steps, the baby may need to be delivered quickly. If the cervix is fully dilated, forceps or a vacuum device may be used to help deliver the baby. Otherwise, an emergency cesarean section may be required.
Take-Home Message
- Fetal Heart Rate Monitoring is an important test to monitor the health of the baby in the womb. This is especially important in high-risk pregnancies.
- This can be done externally and internally. External methods are very safe. The internal method is only done during childbirth, and it also has very little risk.
- The normal heart rate is between 110-160 beats per minute. An abnormality does not always mean there is a big problem, but it is a sign that further testing is needed.
- Always talk to your doctor before using any home devices like a Doppler. Don't be afraid or jump to conclusions. Discuss any concerns with your doctor.
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