Obstetric ultrasound uses sound waves to produce pictures of a baby (embryo or fetus) within a pregnant woman, as well as the mothers uterus and ovaries. It does not use ionizing radiation, has no known harmful effects, and is the preferred method for monitoring pregnant women and their unborn babies.

What is a US obstetric scan?

Obstetric ultrasound was first introduced in the late 1950s. It is now widely used and has become a useful tool in monitoring and diagnosis. Ultrasound scans use sound waves which are considered safe for mother and baby.

How many ultrasounds during pregnancy is normal?

Most healthy women receive two ultrasound scans during pregnancy. The first is, ideally, in the first trimester to confirm the due date, and the second is at 18-22 weeks to confirm normal anatomy and the sex of the baby, explains Mendiola.