What is a low-dose CT scan?

Studies have shown that low-dose CT (LDCT) scans can help detect lung cancer early in certain high-risk people. This specifically includes heavy smokers ages 55 to 74.

LDCT scans use X-rays to create detailed 3-D images of your lungs. They are totally painless and require no special preparation. All you do is lie down on a narrow table as it passes through a ring-shaped CT scanner. At most, you may be asked to hold your breath a few times during the test.

LDCT scans can spot abnormal areas that regular chest X-rays might miss. The benefit is significant: a lower risk of dying from lung cancer. Some potential downsides, however, include:

• Many abnormalities surfaced in LDCT scans do not turn out to be cancer. These findings can cause unnecessary anxiety.

• More tests may determine whether the abnormal area is cancer. Sometimes, these exams can lead to complications.

• Each scan uses a small amount of radiation.

Keep in mind: LDCT scans do not find all lung cancers. It’s also possible the cancers they do find may have already progressed to a later stage.

Who should get screened for lung cancer?

The U.S. Preventive Services Task Force (USPSTF) and other expert groups have created specific guidelines for who should get screened. They recommend yearly LDCT scans for people who are:

• Between the ages of 50 and 80 AND

• Current smokers, or former smokers who have quit in the past 15 years AND

• Have a 20-pack year history of smoking. A pack-year is the equivalent of smoking an average of one pack of cigarettes per day for a year. In other words, smoking a pack a day for 20 years equals 20 pack-years. Smoking two packs a day for 10 years also equals 20 pack-years.

The USPSTF says that screening can stop once a person has not smoked for 15 years or has a health problem that limits their life expectancy or their ability to have lung surgery.

Questions to ask your healthcare provider

Even if you meet all the testing criteria, it’s important to talk with your healthcare provider about your personal health and risk. Some questions to consider asking are:

• What are the limits and risks of screening? Understanding potential outcomes before you go for a screening may reduce feelings of fear or anxiety.

• Am I healthy enough to get a screening? The risks of screening outweigh the benefits for certain people. For example, if someone can’t have lung surgery to remove the cancer, screening may not be a good option.

• Where should I go for a lung cancer screening and treatment, if needed? Expert groups advise to have lung cancer screenings at centers with the proper experience. These facilities should have specialists on staff. They can handle follow-up appointments, questions, and care.

• Is there any cost associated with the annual screening? Medicare and many private health insurance plans cover lung cancers screenings. It’s a good idea to ask your healthcare provider whether insurance will cover it before scheduling a test.