Third Trimester Growth Scan During Pregnancy

3 min read

Reviewed by Dr Prerna Jhawar MBBS, MS(Obstetrics and Gynaecology),
FFM Consultant, Fetal Medicine,
Rainbow Children's Hospitals, Bengaluru

Dr Prerna Jhawar

Dr Prerna Jhawar is a Fetal medicine expert with 12+ years of experience. As a Fetal medicine expert, Dr Prerna takes care of babies while they are still in their Mother’s womb! Sharing the More

Written by Editorial Team

Editorial Team

Third Trimester Growth Scan During Pregnancy

Each stage of pregnancy is fraught with several emotions, joys, and challenges – right from the first trimester, through the second trimester, to the third trimester till you hold your newborn in your secured arms. You have braved through the first two trimesters, and now the real countdown begins with the onset of the third one. Now you should understand more about third trimester growth scan during pregnancy.

As a new mum-to-be, you are now even more excited, nervous, and restless. Your baby is rapidly growing inside you and your due date is coming soon. By now, your doctor may have asked you to go for a third trimester pregnancy growth scan. Find out all about the growth scan, why it is important, and what happens during the scan.

In This Article

What Is The Third Trimester Growth Scan During Pregnancy?

As the name suggests, the third-trimester growth scan is a routine scan that is performed to check if your baby is growing as expected. The third-trimester scan usually measures your baby’s head, leg, and abdominal circumference.

What Will the Doctor Examine at the Third Trimester Growth Scan?

A growth scan in the third trimester is performed so that your doctor has all the necessary information about fetal growth and your pregnancy. The scan helps the doctor to do the following:

  • Check the baby’s overall growth.
  • Check the amount of amniotic fluid.
  • Determine the final position of the placenta.
  • Check the fetal position. This becomes more important as the due date comes closer.
  • Examine your baby’s weight close to the estimated delivery date.
  • Understand if there is a concern due to gestational diabetes.

Doctor may ask you to get additional scans in your third trimester if

  • Your baby is not moving at all or as often as she should be.
  • She is in the breech, oblique, or transverse position.
  • You are carrying twins or more.
  • A previous scan has shown the umbilical cord is around your baby’s neck.
  • The amount of amniotic fluid is not as much as expected.

[Read: Doppler Scan During Pregnancy]

When Should the Third Trimester Scan be Done?

When Should the Third Trimester Scan Be Done_

A growth and fetal well-being scan are usually performed at around 36 weeks of pregnancy. Again, another growth scan and color Doppler study are conducted between 36 and 40 weeks.

Can the Growth Scan Harm Me or My Baby?

Ultrasound scans are considered safe for expectant and their babies. However, you should go for scanning only at the doctor’s recommendation.

Read Also: Electronic Fetal Monitoring During Labor and Delivery


1. How Many Growth Scans In The Third Trimester?

A Growth Scan is often performed between 28 and 32 weeks of pregnancy to examine your baby’s development and the quantity of amniotic fluid. If your pregnancy is regarded as high-risk, you will be given extra scans that will take place at 28, 31, 34, 37, and 40 weeks of gestation. If your pregnancy is assessed as moderately risky, you will be given three extra scans at 32, 36, and 40 weeks. In case your pregnancy is assessed to be at a little higher risk, you will get an extra scan at the 36th week in the third trimester.

2. Can We Know Baby Weight In Growth Scan?

In ultrasonography fetal weight estimate, a 15% inaccuracy is recognized. This indicates that your baby might be 15% smaller or 15% bigger than the predicted weight from your ultrasound. Throughout the first half of your pregnancy, ultrasound scans are often more accurate for determining your baby’s size.

Editorial Team,

With a rich experience in pregnancy and parenting, our team of experts create insightful, well-curated, and easy-to-read content for our to-be-parents and parents at all stages of parenting.Read more.

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