What Are the Risks of a Chest CT Scan?

Radiation

You will receive radiation during a chest CT scan. The amount will vary with the type of CT scan. On average, though, the amount of radiation will not exceed the amount you’re naturally exposed to over 3 years. The radiation from the test is gone from the body within a few days.

Children are more sensitive to radiation because they’re smaller than adults and still growing.

Exposure to radiation is associated with a risk of cancer. However, it’s not known whether the amount of radiation from a chest CT scan puts you at higher risk than the amount of radiation you’re naturally exposed to.

You and your doctor will decide whether the benefits of the CT scan outweigh any possible risks. Your doctor also will try to avoid ordering repeated CT scans over a short period.

Allergic Reaction

The contrast dye used in some chest CT scans can cause an allergic reaction, such as hives or trouble breathing. The risk of this happening is slight. If you do have an allergic reaction, your doctor can give you medicine to relieve it.

The most common contrast dye used in CT scans contains iodine. Tell your doctor if you’re allergic to iodine.