Diagnostic service

Ultrasound

Ultrasound creates images using sound waves reflected from tissues in the area being examined; it does not use X-rays.

About this examination

How ultrasound images are made

A probe sends sound pulses into the selected area and receives the returning echoes. The scanner processes those signals into images for the healthcare professional to review. The method used depends on the body area and the examination requested.

Preparation depends on the examination

There is no single preparation that applies to every ultrasound. Instructions can vary with the body area and the type of examination. Follow the instructions given for your own appointment rather than relying on general advice.

Before you visit

Ask the centre to confirm the exact ultrasound examination, current availability, any referral requirements and any preparation instructions before travelling.

Further information

See the NHS guide to ultrasound scans. This page is a general summary, not personal medical advice. Follow your clinician’s advice.

Common questions

Questions about Ultrasound.

General answers based on patient guidance. Your clinician or imaging team can confirm what applies to your examination.

Ultrasound

What happens during an ultrasound scan?

For many external scans, gel is placed on the skin and a probe is moved over the area being examined. The position and method depend on the body area and the scan requested.

Do I need to fast or arrive with a full bladder?

Preparation varies. Some examinations may require fasting or a full bladder, while others need no special preparation. Follow the instructions for your own appointment.

Is an ultrasound scan painful, and does it use X-rays?

Ultrasound uses sound waves rather than X-rays. An external scan is usually comfortable, though pressure from the probe or a full bladder may feel uncomfortable for some people.

Patient information: NHS guide to ultrasound scans

Please note: Preparation and examination details depend on the specific request. Follow the instructions given for your appointment; these answers are not personal medical advice.

Next step

Ask the centre about your visit.

Your appointment request is confirmed only when the centre replies.

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