What is a lung scan?

A lung scan is a procedure in which the doctor examines your lungs using a radionuclide and x-rays.

When is it used?

This procedure is done when your doctor thinks you may have a blood clot in your lung (a pulmonary embolism).

An example of alternatives is to choose to do nothing, recognizing the risks of your condition. You should ask your doctor about these choices.

How do I prepare for a lung scan?

Follow the instructions provided by the doctor.

What happens during the procedure?

The x-ray technician injects a vein in your arm with a liquid that contains a radionuclide. As this liquid circulates in your bloodstream, a special camera records how the blood is supplied to your lungs. The information is put into a picture for the doctor to look at and learn about your lungs.

The doctor may also have you breathe a small amount of a radionuclide mixed with oxygen through a face mask. The doctor will ask you to breathe in and out and hold your breath. The camera records where the air is going inside your lungs.

What happens after the procedure?

The radiologist sends the complete report to your doctor. You should call your doctor in a few days to hear the results of your test. If you do have a blood clot in your lung, you may need to go to the hospital to have a blood thinner (an anticoagulant).

The small amount of radioactivity is not considered dangerous and will be gone completely within hours to days.

You should ask your doctor what other steps you should take and when you should come back for a checkup.

What are the benefits of this procedure?

This procedure will not cure the problem, but it may help the doctor make a more accurate diagnosis.

What are the risks associated with this procedure?

Reactions to the radionuclide occur rarely. You should ask your doctor how this risk applies to you.

When should I call the doctor?

Call the doctor immediately if:

• You develop a fever.

• You become short of breath.

• You develop chest pain.

Call the doctor during office hours if:

• You have questions about the procedure or its result.

• You want to make another appointment.