Let's learn about the scan that measures the 'size' of the baby in the womb (Fetal Biometry)?

When you go for a scan during your pregnancy, you must have seen the doctor or the person doing the scan looking at the monitor and measuring something, drawing lines, right? Then you must have seen some difficult-to-understand letters on the report you get, like BPD, HC, AC, FL. You may have felt a little scared after seeing these. What exactly is this? This tells you some very important information about the development of the baby growing in your womb. Today, we will talk about this very simply, as if we were talking to a friend.

What is Fetal Biometry in simple terms?

Simply put, Fetal Biometry is the use of ultrasound scans during pregnancy to measure the size of the baby's body. Just like we measure the height, weight, and head circumference of a newborn baby, this involves taking those measurements while the baby is still in the womb.

By taking these measurements, doctors can see if the baby's growth is appropriate for your gestational age. This means that your baby is the normal size for a 20-week-old baby, or if it is smaller or larger. This can be a great help in identifying any problems with your baby's growth early.

What is the importance of taking these measurements?

You may be wondering, "Why measure the baby this way?" This is very important.

• Check if the baby is growing properly: The most important thing is to make sure that the baby's growth is progressing properly by week.
• Identify problems early: Suppose your baby is much smaller than expected. Your doctor can then determine the cause. It could be a problem with the placenta, or it could be a health condition in the mother. Also, if your baby is much larger than expected, it could be a sign that the mother has gestational diabetes. When you know this early, you can get the necessary treatment sooner.
• Confirm the gestational age: Sometimes, measurements taken in the early weeks of pregnancy can help accurately determine how far along you are in your pregnancy and your due date.

What are the main things measured during the scan?

This is what those strange English letters you see on your scan report mean. Doctors mainly focus on a few measurements.

How is this test done?

There is no special preparation or preparation required for this. Fetal Biometry is part of a routine scan during your pregnancy.

The person doing the scan will apply a gel to your belly and move a small device called a transducer over it. The sound waves it emits will create an image of your baby on a monitor. As you look at the monitor, you may have noticed the person doing the scan "clicking" with the mouse and drawing lines. That's how they measure the baby's head, belly, and other parts of the body.

If the pregnancy is less than 12 weeks, which means it's very early, a scan through the vagina (transvaginal ultrasound) can sometimes be done. This can provide clearer images.

What are the 'normal' measurement ranges? How do we understand the report?

This is the biggest question many mothers have. "Is my baby's measurements normal?"

The first thing to understand is that every pregnancy and every baby is different . So "normal" is not a single value, it's a range. For example, at around 20 weeks, normal measurements might look like this:

What are percentiles?

You may have noticed that your report also includes a percentile value along with these numbers. This is how your baby's growth is compared to other babies.

Imagine there are 100 babies who are the same age. If you line them up in order of size from smallest to largest, the one in the 50th percentile is the average size (50th percentile). If your baby's belly size is in the 75th percentile, that means that out of 100 babies your baby is bigger than 75. That means he's a little bigger than average.

So don't be afraid to look at the numbers in the report and draw your own conclusions. Only your doctor can give you the best explanation.

What happens if there are abnormalities in the report?

The first thing to say is, don't panic . One scan report doesn't decide everything.

If there are any abnormalities in the measurements on your scan report, your doctor will often recommend more scans. This is because looking at the baby's development over time (trend) helps to reach more accurate conclusions than a single measurement.

• If the baby is measuring smaller than normal: This could be due to a condition called Fetal Growth Restriction (FGR). Or it could be due to a problem with the baby getting nutrition and oxygen through the placenta.
• If the baby is measuring larger than normal: This may be a sign that the mother has gestational diabetes.

Whatever the case, if it is detected early, doctors can provide the best care for you and your baby. Most of the time, even if there are slight differences in measurements, a healthy, well-being baby is born into this world. So don't overthink it.

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