Primary care clinicians play a critical role in the early recognition and diagnosis of lung cancer. Because symptoms can be subtle and may overlap with more common respiratory conditions, lung cancer may not always be immediately suspected — particularly in patients who do not fit traditional risk profiles.
Maintaining a high index of suspicion and acting on persistent symptoms can help reduce delays in diagnosis and treatment.
“Many people diagnosed with lung cancer today do not fit the traditional risk profile. When symptoms persist, clinicians need to consider lung cancer as part of the differential diagnosis.”
— Dr. Rosalyn Juergens,
Medical Oncologist and President, Lung Cancer Canada
Consider further evaluation when patients present with persistent or unexplained symptoms such as:
If symptoms persist beyond several weeks or worsen, further investigation may be warranted even when risk factors appear low.
Lung cancer screening programs are expanding across Canada and typically use low-dose CT (LDCT) scans to detect lung cancer at earlier stages.
Eligibility criteria vary by province, but screening programs generally target individuals at higher risk, including those with a significant smoking history.
In most provinces, screening referrals are initiated by a family physician or nurse practitioner.
Learn about the screening referral pathway in your province.
Screening eligibility should not delay investigation when symptoms are present.
Patients who do not meet screening criteria may still develop lung cancer, and prompt diagnostic evaluation can reduce delays in diagnosis and treatment.
Primary care providers can initiate evaluation through several steps.
The first step is typically diagnostic imaging, not screening CT. Common initial tests include:
In many provinces, physicians can directly order a CT chest when clinical suspicion is high.
Many provinces have rapid diagnostic pathways designed to shorten the time from suspicion to diagnosis. These programs coordinate imaging, specialist consultation, and biopsy when required.
Examples include:
These programs help ensure timely imaging, biopsy, and specialist referral.
If imaging suggests possible malignancy or symptoms remain concerning, physicians may refer patients to:
Specialists coordinate further testing such as:
Lung cancer should remain in the differential diagnosis when symptoms persist, even in patients who do not fit traditional risk profiles.
Symptoms that may warrant investigation include:
Screening programs are intended for asymptomatic individuals at elevated risk. Patients with symptoms suggestive of lung cancer should be investigated through diagnostic pathways rather than screening programs.
Program: Ontario Lung Screening Program (OLSP)
Screening available: Yes — province-wide program
Eligibility (general criteria)
Who can refer: Family physicians and nurse practitioners.
How to refer
More information
https://www.cancercareontario.ca/en/guidelines-advice/types-of-cancer/lung/screening
Program: BC Lung Screening Program
Screening available: Yes — provincial program
Eligibility (general criteria)
Who can refer: Family physicians and nurse practitioners.
How to refer
More information
http://www.bccancer.bc.ca/screening/lung
Program: Alberta Lung Cancer Screening Program
Screening available: Yes — provincial program
Eligibility (general criteria)
Who can refer: Family physicians and nurse practitioners.
How to refer
More information
https://screeningforlife.ca/lung
Program: Nova Scotia Lung Cancer Screening Pilot Program
Screening available: Yes — pilot program
Eligibility (general criteria)
Who can refer: Family physicians and nurse practitioners.
How to refer
More information
https://www.nshealth.ca/lung-cancer-screening
Program: Lung Cancer Screening Demonstration Project
Screening available: Limited — demonstration projects at selected institutions.
Eligibility (general criteria)
Who can refer: Family physicians and nurse practitioners.
How to refer
More information
https://www.quebec.ca/en/health/advice-and-prevention/screening-and-carrier-testing-offer/lung-cancer-screening
The following provinces do not currently operate province-wide lung cancer screening programs, although initiatives and pilot programs may be under development.
No province-wide program currently in place.
Patients with suspected lung cancer should be investigated through diagnostic imaging and specialist referral pathways.
More information
https://www.saskcancer.ca
No provincial screening program currently in place.
Patients with symptoms or clinical suspicion should be evaluated through diagnostic pathways coordinated by CancerCare Manitoba.
More information
https://www.cancercare.mb.ca
No provincial lung cancer screening program currently in place.
Patients with symptoms should be evaluated through diagnostic pathways and specialist referral.
No provincial lung cancer screening program currently in place.
Patients with symptoms should be investigated through diagnostic imaging and referral pathways.
No provincial screening program currently in place.
Pilot initiatives and evaluations have been explored.
Patients with symptoms should be referred through diagnostic pathways coordinated by NL Health Services.
