Test Overview

A chest X-ray is a picture of the chest that shows your heart, lungs, airway, blood vessels, and lymph nodes. A chest X-ray also shows the bones of your spine and chest, including your breastbone, your ribs, your collarbone, and the upper part of your spine. A chest X-ray is the most common imaging test or X-ray used to find problems inside the chest.

A chest X-ray can help find some problems with the organs and structures inside the chest. Usually two pictures are taken, one from the back of the chest and another from the side. In an emergency when only one X-ray picture is taken, a front view is usually done. Doctors may not always get the information they need from a chest X-ray to find the cause of a problem. If the results from a chest X-ray are not normal or do not give enough information about the chest problem, more specific X-rays or other tests may be done, such as a computed tomography (CT) scan, an ultrasound, an echocardiogram, or an MRI scan.

Why It Is Done

A chest X-ray is done to:

• Help find the cause of common symptoms such as a cough, shortness of breath, or chest pain.
• Find lung conditions—such as pneumonia, lung cancer, chronic obstructive pulmonary disease (COPD), collapsed lung (pneumothorax), or cystic fibrosis—and monitor treatment for these conditions.
• Find some heart problems, such as an enlarged heart, heart failure, and problems causing fluid in the lungs (pulmonary edema), and to monitor treatment for these conditions.
• Look for problems from a chest injury, such as rib fractures or lung damage.
• Find foreign objects, such as coins or other small pieces of metal, in the tube to the stomach (esophagus), the airway, or the lungs. A chest X-ray may not be able to see food, nuts, or wood fibres.
• See if a tube, catheter, or other medical device has been placed in the proper position in an airway, the heart, blood vessels of the chest, or the stomach.

How To Prepare

In general, there's nothing you have to do before this test, unless your doctor tells you to.

How It Is Done

You will need to take off jewellery that might be in the way of the X-ray picture. You may need to take off all or most of your clothes above the waist. (You may be allowed to keep on your underwear if it does not get in the way of the test.) You will be given a gown to wear during the test.

Two X-ray views of the chest are usually taken. One view is taken from the back. The other view is taken from the side of the body. But other views may be needed, depending on what your doctor is looking for. In an emergency, only one picture may be taken, usually from the front.

You will probably stand with your front against an X-ray plate for the pictures. If you need to sit or lie down, someone will help you get into the correct position.

You will need to hold very still during the X-ray to prevent blurring of the picture. You may be asked to hold your breath for a few seconds while the X-ray picture is taken.

Most hospitals and some clinics have portable X-ray machines. If a chest X-ray is done with a portable X-ray machine at your bedside in a hospital, an X-ray technologist and nurse will help you move into the correct position. Usually only one picture from the front is taken.

How long the test takes

The test will take about 10 minutes.

How It Feels

You won't feel any pain from the X-ray itself. If you have pain from your chest problem, you may feel some discomfort if you need to hold a certain position, breathe deep, or hold your breath while the X-ray is done.

Risks

There is always a slight chance of damage to cells or tissue from radiation, including the low levels of radiation used for this test. But the chance of damage from the X-rays is extremely low. It is not a reason to avoid the test.

If you need an X-ray while you are pregnant, a lead apron will be put over your belly to protect the baby from exposure to radiation from the X-rays. The chance of harm is usually very low compared with the benefits of the test.

Results

In an emergency, the results of a chest X-ray can be available within a few minutes for review by your doctor. If it is not an emergency, results are usually ready in 1 or 2 days.