Screening for lung cancer

Last medical review:

Screening means checking for a disease in a group of people who don't show any symptoms of the disease.

Research shows that screening with a CT scan using lower doses of radiation (called a low-dose CT scan) can find lung cancer in people who are at high risk of developing lung cancer before they have any symptoms. This might help lower their risk of dying from lung cancer.

People who currently smoke tobacco or used to smoke tobacco have the highest risk of developing lung cancer. Talk to your healthcare team about your risk for lung cancer.

If you aren’t at high risk for lung cancer, you shouldn’t be screened for the disease. There isn’t enough evidence to know is screening is effective for people who don’t have a high risk because of their smoking history or other risk factors for lung cancer.

Some provinces and territories are starting to offer organized lung cancer screening programs and pilots. Find out more about lung cancer screening.

Expert review and references

  • Canadian Cancer Society | Société canadienne du cancer
  • Lam S, Bai C, Baldwin DR, Chen Y, Connolly C, de Koning H, et al. Current and future perspectives on computed tomography screening for lung cancer: a roadmap from 2023 to 2025 from the International Association for the Study of Lung Cancer. Journal of Thoracic Oncology. 2023: 19(1):36–51.
  • Tammemägi MC, Darling GE, Schmidt H, Walker MJ, Langer D, Leung YW, et al. Risk-based lung cancer screening performance in a universal healthcare setting. Nature Medicine. 2024: 30(4):1054–1064.
  • Canadian Partnership Against Cancer. Lung Screening in Canada, 2023–24. Toronto, ON: 2024. https://www.partnershipagainstcancer.ca/.

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