Growth Scans
Sometimes the need to assess fetal growth and well-being arises in the late second or third trimester of pregnancy. Reasons for referral may include previous complications of pregnancy, maternal medical conditions e.g. diabetes or if there is a clinical question e.g. small for dates.
What does the scan look at?
During your growth scan, we check several important aspects of the fetal development and your pelvic health, including:
- Fetal presentation (cephalic, breech, transverse)
- Placental position
- Fetal size and growth interval
- Fetal heart rate and rhythm
- Amniotic fluid around the fetus
- Fetal activity
- Analysis of blood flow in the umbilical artery (further assessment of blood flow in the fetal brain and liver is performed if indicated)
- Review of uterine fibroids and ovarian masses if required
How we measure fetal growth
Fetal size can be assessed by measuring four parameters:
These measurements are plotted on a growth chart and an estimate of fetal weight can be made.
To assess fetal growth, serial scans may be performed to assess progression on the growth chart.
- Biparietal diameter (BPD)
- Head circumference (HC)
- Abdominal circumference (AC)
- Femur length (FL)
These measurements are plotted on a growth chart and an estimate of fetal weight can be made.
To assess fetal growth, serial scans may be performed to assess progression on the growth chart.
Fetal doppler ultrasound in pregnancy
If fetal growth measurements are not average or there is maternal medical conditions assessment of the umbilical artery is made to assess the resistance of the blood flow into the placenta.
If the fetus is smaller than expected or there is question over placental function, assessment of the Middle Cerebral Artery (fetal brain) and ductus venosus (vein in fetal liver) may be performed. Further evaluation of the Middle cerebral artery will occur if there is suspicion of anaemia.
If the fetus is smaller than expected or there is question over placental function, assessment of the Middle Cerebral Artery (fetal brain) and ductus venosus (vein in fetal liver) may be performed. Further evaluation of the Middle cerebral artery will occur if there is suspicion of anaemia.
Will the scan be in 3D or 4D?
At Ultrasound North, growth scans are performed for clinical reasons - however, we’ll always try to give you a glimpse of your baby in 3D or 4D during the appointment. Just keep in mind that image quality can depend on fetal position and cooperation.
