What is an x-ray?
An x-ray is a widely used test which creates an image of the inside of the body, much like a photograph. It is very quick. It's often the first point of investigation to help the doctor decide if any other forms of imaging or tests are needed.
Depending on the type of examination you are having, you may need to prepare beforehand. Your letter will give you all of the information you need which is specific to the test you are having.