An ultrasound scan (or sonogram) is a procedure that uses high-frequency sound waves to create an image of inside the body.
It is commonly used to monitor a foetus, investigate symptoms further or diagnose a condition.
Most ultrasound scans take between 15 – 45 minutes. There are different types of scans depending on which part of the body is being scanned and why. The type of ultrasound you will have will be explained to you beforehand.