An x-ray is a painless test in which an image of part of the body is created by using low doses of electromagnetic radiation and recorded on film or fluorescent screens. X-rays can be used to diagnose a wide range of conditions, from bronchitis to a broken arm. Depending upon a physician’s evaluation of an x-ray image, further tests may be ordered.

X-rays are often used to help detect and diagnose cancers in the body, including those of the lungs, intestines, stomach, kidneys and breasts. An X-ray may detect a tumor in an organ such as the lung, and can indicate if the cancer has spread (metastasized) to other parts of the body.

X-ray images typically are taken with no preparation, but in some cases, the physician might use a special dye called a contrast medium. This dye appears on the x-ray image and is helpful in highlighting certain structures and conditions within the body. If contrast medium is going to be used in an x-ray, the patient may need to alter his or her diet or medication schedule. Women who are pregnant or who might be pregnant are urged to either avoid x-rays or to wear a protective lead apron over their abdominal area.