What is a Growth Scan? – A growth scan is an ultrasound examination performed during the third trimester of pregnancy to assess the baby’s size, growth rate, and overall wellbeing.
It measures key body parts, estimates fetal weight, checks amniotic fluid levels, and evaluates the placenta.
Why and When Growth Scans Happen
Doctors recommend growth scans when there are concerns about the baby’s growth, such as the mother having high blood pressure, diabetes, or a history of small or large babies. They can also be routine in some pregnancies. Scans typically occur between 24 and 41 weeks, often around 28–36 weeks.
What a Growth Scan Measures
The sonographer takes several measurements:
- Head circumference and biparietal diameter
- Abdominal circumference
- Femur (thigh bone) length
These help calculate the estimated fetal weight and compare it to average growth charts. The scan also checks:
- Amniotic fluid volume
- Placental position and appearance
- Baby’s position and movements
- Blood flow in the umbilical cord (in some cases)
How It Works
The procedure is non-invasive and similar to other pregnancy scans. You lie on your back while the sonographer applies gel to your abdomen and uses an ultrasound probe. It usually takes 15–30 minutes. No full bladder is required.
Also Read-What is 29 Days from Now?
Benefits
Growth scans help detect issues early, such as:
- Fetal growth restriction (small for gestational age)
- Macrosomia (large for gestational age)
- Low or high amniotic fluid levels
- Placental problems
FAQs : What is a Growth Scan?
Is a growth scan the same as an anatomy scan?
No. The anatomy scan (usually at 18–22 weeks) checks organ development. A growth scan focuses on size and wellbeing in later pregnancy.
Do all pregnant women need a growth scan?
No. They are offered when there is a medical reason or specific risk factors. Many pregnancies do not require them.
What happens if the baby measures small or large?
The doctor may recommend more frequent scans, additional tests (like Doppler), or closer monitoring. It does not always mean a problem.
How accurate is the weight estimate?
Estimates can vary by 10–15% from actual birth weight, especially near term.