There are many ways to check if your pregnancy is going according to the norm. Apart from checking your weight, ultrasounds, and your vitals, your doctor might also mention checking the fundal height. This is done in order to check the progress of the baby’s development and if the rate of development is normal.
Fundal height is used to measure the growth and development of the foetus after 20 weeks of pregnancy. It is the measurement from the top of the pubic bone to the top of the uterus. Fundal height in pregnancy is usually measured using a measuring tape. This measurement should match the gestation period within one to three centimetres. The fundal height or McDonald’s Rule will increase as your pregnancy progresses.
If the mother does not showcase any factors for skewed fundal height measurement, then such a measurement could be indicative of the following factors:
However, you must keep in mind that irregular fundal height is not always indicative of any significant issue with your pregnancy.
Fundal height can be measured very easily. Here is a step by step procedure for measuring the fundal height.
It is best that you get the fundal height measurement done by your OB/GYN. This will give you the opportunity to discuss any irregularities in the measurement. So, the first step would be to visit your doctor.
Make sure that you empty your bladder entirely before you step into your appointment to have the fundal height measured. Even a half-full bladder can cause a discrepancy in the fundal height measurements which can lead to unnecessary panic.
You will be asked to change into a hospital gown as your regular clothes might influence the fundal height measurement.
Your doctor will ask you to lie down as this will allow your doctor to measure the fundal height accurately.
Your doctor will ask you to breath slowly and steadily which ensures that there is not too much variation in your belly’s size and allows your doctor to gain an accurate reading.
Your doctor will now measure the fundal height using a tape measure. The height is measured from the top of the uterus which will be in your stomach area to the top of the pubic bone which is in the pelvic region.
You can now change into your normal clothes and discuss the measurement with your doctor.
If there is any discrepancy in the fundal height measurement, then your doctor might ask for a series of investigative tests to find out the cause of the measurement. These tests might include an ultrasound. Your doctor might recommend that you get the tests done immediately or you could make an appointment for a later date.
Fundal height is measured and recorded on a chart that also contains the normal fundal height range marked on it based on the gestation period. The fundal height chart by week has two variables: the X-axis marks the gestation period in weeks while the Y-axis marks the fundal height. The normal chart has two slopes marked on it to mark the range of normal fundal height. When your doctor measures your fundal height, she will mark the results on this chart. Depending on the location of the fundal height on the chart and the slope it creates when compared to the previous measurement, your doctor will be able to see if the growth of the foetus is regular or not. For example, the fundal height measurement for week 20 of the pregnancy should be between 18 to 22 centimetres. In fact, a rule of thumb that you can follow is that the fundal height should match the number of weeks that you have been pregnant with a couple of centimetres above and below as the normal range.
The reasons for a larger fundal height could include:
The reasons for a smaller fundal height could include:
Fundal Height is a tool used to measure the growth and development of the foetus. It is usually a starting point to check for any irregularities which have to be confirmed by other investigative tests. Please consult with your doctor if you think that the fundal height does not fall within the normal range.