As you approach the final weeks of pregnancy, you may be offered a 9‑month pregnancy scan. This late pregnancy ultrasound provides essential information about your baby’s health, position, and readiness for birth. Here’s everything you need to know.
What Is the 9‑Month Pregnancy Scan Called?
In the UK, the 9‑month pregnancy scan is typically referred to as the third‑trimester growth scan or late pregnancy ultrasound.
Other Names for the 9‑Month Scan in the UK
- Third‑trimester scan
- Growth ultrasound
- Final pregnancy scan
How It Differs From Earlier Scans
Earlier scans, such as the 12‑week dating scan and the 20‑week anomaly scan, focus on assessing your baby’s development and identifying potential abnormalities. By contrast, the 9‑month pregnancy scan evaluates growth, position, and amniotic fluid levels, preparing you and your healthcare team for a safe delivery.
Why Is the 9‑Month Pregnancy Scan Done?
Checking Baby’s Position & Growth
The scan helps confirm whether your baby is head‑down (cephalic), breech, or lying sideways. It also measures your baby’s size to ensure they are growing appropriately for their gestational age.
Monitoring Amniotic Fluid Levels
Your midwife or sonographer will check whether your amniotic fluid levels are within a healthy range. Too little (oligohydramnios) or too much (polyhydramnios) fluid can indicate potential complications.
Detecting Late Pregnancy Complications
The 9‑month scan can identify concerns such as placenta praevia, restricted growth, or umbilical cord issues, allowing timely decisions to ensure a safe delivery.
When Should You Get the 9‑Month Scan?
Ideal Week for the Scan
Most third‑trimester growth scans are carried out between 36 and 40 weeks. Women with moderate or high‑risk pregnancies may also be offered additional scans at 32 weeks.
What If You Miss the Scan?
If you miss your appointment, contact your midwife or obstetrician as soon as possible. While not mandatory, this scan provides important information about your baby’s well‑being.
What to Expect During the Scan
How Long Does It Take?
The 9‑month pregnancy scan usually lasts 20 to 30 minutes, although it may take longer if the baby is in a difficult position.
What You Need to Prepare (Fasting, Water Intake, etc.)
You do not need to fast, but you may be asked to drink some water beforehand. A slightly full bladder can help produce clearer ultrasound images.
Is It Safe for Baby?
Yes. According to the NHS, routine ultrasound scans are safe for both you and your baby, with no evidence of harm.
Understanding Your Scan Results
Normal Findings
- Baby is head‑down and in the correct position for birth
- Growth matches the expected centile for gestation
- Amniotic fluid levels are healthy
- Placenta and umbilical cord appear normal
When to Talk to Your Doctor
If the scan shows breech position, restricted growth, or unusual fluid levels, your obstetrician may recommend closer monitoring, induction, or other interventions to ensure a safe delivery.
FAQs About Late Pregnancy Scans
Can You Skip the 9‑Month Scan?
Yes, especially if you have a low‑risk pregnancy. However, it can provide valuable reassurance and detect complications that might otherwise go unnoticed.
Is 3D/4D Scanning Better at 9 Months?
3D and 4D scans offer clearer images and make great keepsakes, but they are not medically necessary. Standard 2D ultrasound remains the preferred method for clinical assessment.
Expert Opinions
According to NHS guidelines, late pregnancy scans are recommended when there are concerns about growth or complications.
Dr Sarah Williams, Consultant Obstetrician at St George’s Hospital, says:
“The third‑trimester growth scan is crucial for identifying late‑pregnancy issues such as breech presentation or low amniotic fluid, allowing timely intervention.”
Midwife Claire Thompson adds:
“For many mums, this scan offers reassurance. Seeing the baby one last time and knowing everything is fine can ease anxiety before labour.”
Obstetrician Consultation
Worried about your 9‑month scan? Book a consultation with a certified obstetrician today using Doctorshire.