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Lung cancer screening (low-dose CT / LDCT)

Cancer

Varies by province (commonly 50–80)Typically yearly while eligible10–15 minutes

Low-dose CT (LDCT) lung screening is intended for eligible high-risk people (program-defined) and is not recommended for average-risk individuals.

Important Note

LDCT screening is for eligible, asymptomatic, high-risk individuals. Symptoms should be evaluated diagnostically.

Guidance for your location

Location
Country
Select a country only if you want local program matching.
Region-specific program details are not available for this location yet, but you can still use the general profile information.
Recommended Age
Varies by province (commonly 50–80)
Frequency
Typically yearly while eligible
Duration
10–15 minutes

Overview

LDCT uses low-dose radiation to create detailed images of the lungs. In Canada, lung screening is typically offered through provincial programs for eligible, asymptomatic people with substantial smoking exposure. Eligibility criteria vary by province and may be determined through a program intake process. Because LDCT can find incidental findings and false positives, it’s used only when the potential benefits outweigh the harms.

Who Should Get This Screening

  • Eligible, asymptomatic people who meet the age and smoking-history criteria for their provincial program (see Program section above).
  • Typically current or former smokers with substantial lifetime exposure; exact criteria vary by province.
  • People with symptoms (coughing up blood, persistent cough, unexplained weight loss, chest pain) need diagnostic evaluation, not screening.
  • People who are not high-risk generally should not be screened because the harms can outweigh the benefits.

What to Expect

You lie on a table that moves through a CT scanner (a large ring). The scan is quick and does not usually require contrast dye or needles. You may be asked to hold your breath briefly.

How to Prepare

Follow these tips to prepare for your screening

  • No fasting is usually required.
  • Wear clothing without metal around the chest if possible.
  • Be ready to share smoking history details (years smoked, average amount, quit date) for program intake.

Benefits

  • Can detect lung cancer earlier in eligible high-risk groups.
  • Provides a structured follow-up pathway when nodules are found.

Things to Consider

  • False positives can lead to additional imaging or procedures.
  • Incidental findings may trigger further testing.
  • Radiation exposure (low-dose, but repeated over time).
  • Overdiagnosis of some slow-growing cancers is possible.

Guideline Source: Provincial lung screening programs (Canada) (see Program section above)

This information is provided for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized recommendations.