When you went to the clinic during your pregnancy, you must have seen the doctor carefully take a tape measure and measure your belly, right? You may have also thought, "Why is my belly being measured every day? What can this tell you?" This is actually a very important thing. With this simple measurement, the doctor can get a good idea of many things, such as the growth of the baby in your womb, how he is doing. Today, we will talk about this measurement, which is called 'Fundal Height'.
Simply put, what is Fundal Height?
Fundal Height is a very simple thing. When you're pregnant, it's the distance in centimeters from the top of your pubic bone to the top of your uterus (fundus) .
This measurement allows the doctor to learn several important things:
- Baby's size and growth: This helps to see if the baby is growing well for the week.
- Baby's position: You can get a rough idea of the baby's position inside the womb.
- Confirming the gestational age: This measurement is checked to see if it matches the number of weeks you are pregnant (gestational age).
Usually, the doctor starts taking this measurement at every clinic visit when you are about 20 weeks pregnant. This is because from that point on, your gestational age and the fundal height measurement begin to largely match each other.
How do you take this measurement?
This is a very simple, painless procedure. There is nothing special for you to prepare for. This is just part of your routine checkup.
The doctor does this like this:
1. First, you will be made to lie down on the exam table.
2. Then, the doctor will very gently feel your lower abdomen and find the top of your pubic bone (symphysis pubis).
3. Next, they also carefully palpate the abdomen to find where the top of the uterus (fundus) is.
4. Finally, using a measuring tape, measure the distance in centimeters between the two places you initially found.
That distance you measured will be your Fundal Height. Very easy, right?
The position of the uterus changes as pregnancy progresses. For example, at about 12 weeks, the uterus is at its highest point, near your pubic bone. By 20 weeks, it is almost at your belly button. By about 36 weeks, the uterus is as high as it can go, almost to your breastbone (sternum).
But after 36 weeks, the baby starts to drop into the pelvis as it prepares for birth. So, the fundal height may decrease slightly in the last few weeks. If this happens, your doctor may do other tests to make sure there is no other cause.
What should the Fundal Height be from week to week?
There's a very simple rule for this. Usually, between weeks 20 and 36, the Fundal Height, measured in centimeters, should be roughly the same as the number of weeks you've been pregnant. But it doesn't have to be exactly the same. It's okay to be 2 centimeters off (more or less).
For example, if you are 32 weeks pregnant, it is normal for your fundal height to be between 30 and 34 centimeters.
But remember, this is most accurate after 20 weeks. Before that, the uterus has not risen high enough, so this measurement is not accurate.
What if the measurement is 'larger' than expected?
Sometimes your fundal height may be higher than your gestational age. There could be several reasons for this. Don't be alarmed when you hear this.
| Reason | A simple explanation |
|---|---|
| The due date is incorrect. | It may take a few more weeks than you think. |
| Uterine Fibroids | Harmless tumors in the uterus can cause the uterus to enlarge. |
| Mother's body weight | If the mother is overweight, the measurement may appear a little higher. |
| Twins | The uterus becomes larger when there is more than one child. |
| Increased amniotic fluid (Polyhydramnios) | The amount of water (amniotic fluid) surrounding the baby is higher than normal. |
| Baby's position (Breech) | The measurement may increase when the baby is in a breech position. |
| Fetal Macrosomia | The baby may be a little larger than normal. |
Sometimes, the measurement may increase slightly for no apparent reason.
What if the measurement is 'less' than expected?
Also, sometimes the Fundal Height may be lower than expected. Don't worry about that either. There may be reasons like this.
| Reason | A simple explanation |
|---|---|
| Mother's physical condition | If you are thin, short, or have strong abdominal muscles, the measurement may be lower. |
| Low amniotic fluid (Oligohydramnios) | The amount of water (amniotic fluid) surrounding the baby is less than normal. |
| Baby descending into the pelvis | If the baby is close to being born and has dropped into the pelvis, the measurement will decrease. |
| Slow growth of the baby (Fetal Growth Restriction) | There may be a case where the baby's development is a little slow. |
Should I be afraid of this?
Not at all. Fundal Height measurement is just a first step to get a rough idea of your baby's growth. It's not 100% accurate. It's very normal for 1 or 2 centimeters to vary.
The most important thing is that if your doctor has any doubts about this measurement, he will not just sit there. He will definitely do further testing, such as an ultrasound scan, to confirm exactly how the baby is doing.
So don't worry if the measurement is a little off. It doesn't mean there's a problem, it just means you need to check it out further. If you have any doubts or fears, talk to your doctor about them openly.
Take-Home Message
- Fundal Height is a simple, painless method used to monitor the baby's growth during pregnancy.
- It's normal for this measurement to be 1-2 centimeters more or less than your actual week. Don't worry about it.
- Whether the measurement is higher or lower than expected, it doesn't necessarily mean there's a problem. There could be many simple reasons for it.
- If your doctor has any doubts about the measurement, he will definitely refer you for further testing, such as an ultrasound scan.
- Never hesitate to talk to your doctor about any questions or concerns you may have during pregnancy.
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