Pregnancy Ultrasound
Preparing for your pregnancy scan
Quick reference
Scan type
Ultrasound
Duration
20-45 minutes
Preparation
Varies by trimester
Bring
Appointment letter
What is a pregnancy ultrasound
Pregnancy ultrasounds use sound waves to produce images of the developing baby and associated structures. They are a routine and important part of antenatal care. They do not use radiation. Common types include an early pregnancy viability scan, nuchal translucency scan (approximately 11 to 14 weeks) and the mid-pregnancy anomaly scan (approximately 18 to 22 weeks).
Why is it performed
Pregnancy scans may be performed to confirm a pregnancy, assess the position and development of the baby, check the placenta and amniotic fluid, estimate gestational age, assess fetal growth, or investigate bleeding or other concerns.
How should I prepare
Preparation varies by the type and timing of the scan. For early pregnancy scans (before 10 to 12 weeks), a full bladder is often requested to improve the image quality. For mid-pregnancy and later scans, a full bladder is generally not required. For an anomaly scan, you may be asked to have a partially full bladder - your clinic will advise. Always follow the preparation instructions given by your midwife, maternity unit or imaging centre. These take priority over general guidance.
What should I wear
Wear comfortable, two-piece clothing that allows easy access to your abdomen without needing to fully undress.
What happens during the scan
Gel is applied to your abdomen and a probe is moved over your skin to create images of the baby. You may be shown the images on a screen. A transvaginal scan may be used in early pregnancy or if the abdominal view is unclear - the sonographer will explain this before proceeding.
Will it hurt
Pregnancy ultrasound is generally painless. A very full bladder may be uncomfortable during early scans. Let the sonographer know if you are in significant discomfort.
How long does it take
Scans typically take 20 to 45 minutes depending on the type and the position of the baby.
When will I get results
The sonographer may share some observations during the scan. Formal results and any follow-up discussions are arranged through your maternity team or referring clinician. Ask your maternity unit or imaging centre about how and when results will be communicated.
When should I contact the clinic
Contact your clinic or maternity unit if you have any concerns before or after the scan, or if your symptoms change before the appointment.
Always follow your clinic specific instructions. The information here is general guidance only. Your clinic may have different requirements.