An ultrasound scan, often referred to simply as an echo, is an examination that allows us to look inside your body. It uses sound waves to make organs and tissues visible on a screen. GPs use echoes for various purposes, for example to detect disorders or to monitor the growth of an unborn baby during pregnancy.
The examination proceeds as follows: the radiologist applies some conductive fluid — a type of gel — to your skin and moves a small device, called a transducer, over the part of the body being examined. This device emits sound waves, which are captured and converted into an image. The examination is safe, harmless and painless, as no harmful radiation is used.
An ultrasound scan usually takes between 15 and 30 minutes. It is advisable to wear comfortable clothing so that the ultrasound equipment can be placed properly on the skin.
For some ultrasound examinations, preparation is important in order to obtain a good result. If the preparation instructions are not followed correctly, it may not be possible to carry out the examination and a new appointment will have to be made.
For an ultrasound scan of the upper abdomen, during which organs such as the liver, gallbladder and pancreas are examined, you will be asked not to eat or drink anything for four hours prior to the examination. A small sip of water is permitted, for example to take medication. You may eat and drink again immediately after the examination.
You do not need to fast before an ultrasound scan of the kidneys and lower abdomen. However, it is important that your bladder is full, as this helps to produce better images. Therefore, drink plenty of water and do not urinate for one hour before the examination.
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