Quick Answer
Growth Scan is a prenatal ultrasound performed between 28 and 36 weeks to determine how well the baby is developing inside the womb. It measures the baby’s head, abdomen, and limb lengths, calculates foetal weight, and assesses the health of the amniotic fluid and placenta. It is safe, non-invasive, and medically approved, allowing doctors to identify and address issues early.
Quick Overview Table
Here’s a comprehensive overview of everything covered in this blog: what a growth scan is, when it’s performed, what it looks for, and how to interpret the data.
| Topic | Key Information |
| What is it? | Ultrasound to monitor fetal size and well-being in the third trimester |
| When is it done? | Typically between 28–36 weeks; more often in high-risk cases |
| What does it check? | Head, abdomen, femur, fluid, placenta and Doppler blood flow |
| How to read results? | Measurements plotted on percentile chart; 10th–90th is normal range |
| Is it safe? | Yes, uses sound waves only, not radiation, safe for mother and baby |
| When to see a doctor? | Low growth, abnormal fluid, poor Doppler signal or reduced movement |
Table of Contents
- Introduction
- What Is a Growth Scan in Pregnancy?
- Why Is a Growth Scan Done?
- Growth Scan Timing: Which Week and Which Trimester
- What Does a Growth Scan Check?
- Growth Scan Procedure: What to Expect
- How to Read Growth Scan Results
- Growth Scan with Doppler: When and Why It Is Added
- Growth Scan Safety: Sound Waves, Not Radiation
- Growth Scan Cost and Finding a Scan Centre
- When to Consult a Doctor After a Growth Scan
- Conclusion
- FAQs
Introduction
Pregnancy is a journey with many milestones, and one of the most encouraging steps in the third trimester is the growth scan. Many expectant parents look up this term with a mix of curiosity and alarm, asking what it measures, when it’s needed, and what the results signify. Understanding this scan helps parents feel prepared and secure while entering the ultrasound room.
This article will teach you everything you need to know about the growth scan in pregnancy, including its purpose, schedule, technique, results, and when your doctor may urge additional follow-up.
What Is a Growth Scan in Pregnancy?
A growth scan is a specialist ultrasound examination conducted in the third trimester of pregnancy to evaluate foetal development and overall well-being. Unlike the normal date or anomaly scans performed earlier in the pregnancy, the growth scan focuses on how the baby is growing in the final weeks before birth.
The scan measures the baby’s main physical parameters, such as head size, abdomen circumference, and femur bone length, and utilises this information to determine the foetal weight. It also assesses the amniotic fluid volume and placental position, providing the obstetric team with a comprehensive picture of the baby’s status inside the womb.
Also read: https://www.clarityimaging.in/pregnancy-scan-list/
Why Is a Growth Scan Done?
Doctors recommend a foetal growth scan for a variety of clinical reasons, all based on monitoring the baby’s health and spotting any issues early enough to intervene.
Here are the main reasons why this scan is performed:
- Monitor fetal growth rate
- Estimate fetal weight
- Check amniotic fluid levels
- Assess placenta health
- High-risk pregnancy monitoring
Growth Scan Timing: Which Week and Which Trimester
Growth scans are typically performed in the third trimester. Most doctors recommend performing the initial growth scan between 28 and 30 weeks, followed by a second scan between 32 and 36 weeks, depending on clinical findings. High-risk pregnancies may necessitate growth scans every two to three weeks after 24 weeks.
| Gestational Period | Purpose of Growth Scan |
| 28–30 weeks | Baseline fetal size check; detect early growth deviations |
| 32–34 weeks | Monitor growth velocity; assess fluid and placenta grade |
| 35–37 weeks | Pre-delivery size estimate; confirm presentation and position |
| High-risk cases | Every 2–3 weeks from 24 weeks as per the doctor’s advice |
| Post-term pregnancy | Weekly monitoring until the delivery decision is made |
What Does a Growth Scan Check?
A growth scan ultrasound is a thorough examination of many foetal and uterine characteristics.
Each measurement has a unique diagnostic purpose:
- Head Circumference (HC)
- Abdominal Circumference (AC)
- Femur Length (FL)
- Estimated Fetal Weight (EFW)
- Amniotic Fluid Index (AFI)
- Placenta Grade and Position
- Baby’s Position and Movement
Growth Scan Procedure: What to Expect
Here’s a step-by-step explanation of what happens during a growth scan ultrasound appointment:
- Preparation
- Positioning
- Ultrasound probe
- Measurements recorded
- Doppler assessment (if advised)
- Report generation
Also read: https://www.bmus.org/static/uploads/resources/Aug_2009_Fetal_Measurements_D3NApK5.pdf
How to Read Growth Scan Results
Each measurement is shown on a standardised growth chart, and the percentile indicates where the baby falls in comparison to other newborns of the same gestational age.
| Percentile Range | What It Means |
| Above 90th percentile | Baby is large for gestational age (LGA); may need further review |
| 10th to 90th percentile | Normal growth range; baby is developing well |
| 3rd to 10th percentile | Small for gestational age (SGA); monitored closely |
| Below 3rd percentile | Significant growth restriction; doctor review essential |
Growth Scan with Doppler: When and Why It Is Added
A growth scan with Doppler, also known as a growth and Doppler scan, combines routine foetal biometry with measurements of blood flow through the umbilical cord, uterine arteries, and foetal brain vessels. This additional layer of information is not required in all pregnancies, but it is critical in some clinical conditions.
A Doppler scan is usually recommended by doctors when growth restriction is suspected, the mother has hypertension or placental malfunction, there is less foetal movement, or a prior scan revealed abnormal fluid levels.
Growth Scan Safety: Sound Waves, Not Radiation
One of the most prevalent concerns raised by expectant parents is whether the scan would harm the baby. The answer is reassuring: ultrasonic technology generates images using high-frequency sound waves rather than X-ray radiation.
There is no ionising radiation involved, and there is no convincing clinical evidence that diagnostic ultrasonography is harmful when used as prescribed.
- No radiation exposure
- Short, focused exposure
- International safety consensus
- Operator expertise matters
Growth Scan Cost and Finding a Scan Centre
The cost of a growth scan in India ranges from ₹500 to ₹2,500, depending on the city, facility, and Doppler component. Standard growth scans are typically less expensive than combined growth and Doppler scans. Prices for private ultrasound scan centres in coimbatore and hospital-based radiology departments may vary. Always confirm the cost structure at your preferred centre before your appointment.
When to Consult a Doctor After a Growth Scan
Do not wait for your next scheduled appointment if you discover or are informed of any of the following:
- Estimated fetal weight below the 3rd percentile
- Abnormal amniotic fluid levels
- Absent or reversed Doppler flow
- Sudden reduction in fetal movement
- Placenta praevia or low-lying placenta
Disclaimer
The information in this article is meant solely for educational awareness and general information. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional or doctor regarding any medical condition or health concern.
Conclusion
A growth scan is one of the most useful tools for expecting parents and their medical teams in the third trimester. It offers a clear, real-time image of the baby’s development, the placenta’s function, and whether any early intervention is required before birth. A well-understood growth scan, rather than causing fear, might provide reassurance.
For a safe and reassuring pregnancy journey, book your growth scan with an experienced scan centre and get clear insights into your baby’s development.
FAQs
1. What is a growth scan in pregnancy?
A growth scan during pregnancy is an ultrasound scan that monitors the baby’s growth, weight, and overall development inside the womb.
When is a growth scan done during pregnancy?
A growth scan is often performed during the third trimester, between 28 and 36 weeks of gestation.
3.What does a growth scan check?
A growth scan evaluates the baby’s size, amniotic fluid level, placenta position, heart rate, and blood flow.
4. How to read growth scan results?
The growth scan findings are obtained by evaluating the baby’s size, weight, and development and comparing them to the projected growth for the pregnancy stage.
5.Is a growth scan safe for the mother and baby?
Yes, a growth scan is considered safe for both the mother and the baby because it employs sound waves rather than radiation.
6.What is the difference between an anomaly scan and a growth scan?
An anomaly scan looks for structural anomalies in the infant, whereas a growth scan assesses the baby’s growth and well-being later in pregnancy.
7. What is a growth scan with Doppler?
A growth scan with Doppler is an ultrasound that assesses the baby’s health by measuring blood flow between the baby, placenta, and uterus.
8.What is the cost of a growth scan?
In India, a growth scan typically costs between ₹1,500 and ₹4,000, depending on the hospital or diagnostic institution.
