Radiology• Updated 21 October 2026
Ultrasound Scan
A safe, painless scan that uses sound waves to create pictures of organs, blood flow and babies in the womb.
Results: Usually the same day
Quick Summary
Primary Purpose
To look at the tummy, pelvis, thyroid, heart, blood vessels and pregnancy.
What It Measures
Images of soft tissues and fluid.
Preparation
Depends on the area: fasting for tummy scans, a full bladder for pelvic scans.
Overview
Ultrasound uses no radiation, so it's safe in pregnancy.
Gel is spread on the skin and a probe is moved over it.
What It Measures
Organs
Liver, gallbladder, kidneys and more.
Pregnancy
Baby's growth and position.
How It's Performed
- 01
Preparation
Follow instructions about fasting or a full bladder.
- 02
Scan
Gel is applied and the probe moved over the skin; it takes 15–30 minutes.
- 03
Afterwards
Wipe off the gel and go home.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Ultrasound(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Ultrasound scan(opens in a new tab) · NHS