Diagnostics·Diagnostics
Obstetric ultrasound
Informed by recognized medical guidance
Overview
An obstetric ultrasound is a safe imaging test that uses sound waves to create pictures of your baby (fetus) inside your womb. It helps your healthcare team check your baby's growth, position, and health during pregnancy.
Key facts
- Obstetric ultrasound uses no radiation, so it is very safe for you and your baby.
- It is usually done two or more times during a typical pregnancy — in the first trimester (around 8–14 weeks) and again in the second trimester (around 18–22 weeks).
- The test can show the baby’s heartbeat, size, organs, and sometimes the sex — if you want to know.
Yes, obstetric ultrasound is a routine part of prenatal care in most countries, including the UK, where it is offered through the NHS to all pregnant women.
It is used for anyone who is pregnant, usually starting around 8–12 weeks. It is also used in early pregnancy to confirm a heartbeat or check the number of babies (single or multiples).