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How is lung cancer diagnosed?

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You might have a number of tests to investigate your symptoms and confirm a diagnosis of lung cancer, including:

  • medical history and physical examination
  • imaging tests, such as chest X-ray, computed tomography (CT) scan, magnetic resonance imaging (MRI) scan, 
  • nuclear medicine imaging, such as a positron emission tomography (PET) scan or bone scan. A weak radioactive substance is injected into the body to show the cancer in a clearer way. A bone scan can show cancer that has spread to the bones.
  • laboratory tests on blood or tissue
  • lung biopsy, where a small sample of tissue or fluid is removed, usually with a thin needle, to be examined under a microscope. This can be done percutaneously (through the skin) using imaging guidance, or through a bronchoscopy.
  • sputum cytology, where a sample of sputum (mucus coughed up from the lungs) is examined under a microscope
  • bronchoscopy, where a thin tube with a light and a lens on the end is inserted through the nose or mouth to look inside the trachea (windpipe) and large airways in the lungs, or to take biopsies
  • video-assisted thoracoscopy, where a thin tube with a light and a lens on the end is inserted into the chest (through a cut made between two ribs) to look for abnormalities, or to take biopsies
  • thoracentesis, where fluid is removed with a needle from the space between the lining of the chest and the lung, to be examined under a microscope
  • mediastinoscopy and mediastinotomy, where a thin tube with a light and a lens on the end is inserted into the area between the lungs (through a cut in the front of the neck or between two ribs) to look for abnormalities, or to take biopsies.

Staging

If you are diagnosed with lung cancer, you might have more tests to determine the stage of the disease and whether the cancer has spread to other parts of the body. Knowing the stage of the disease helps your medical team plan the best treatment for you.

Non–small cell lung cancer is divided into 6 stages, depending on whether the cancer has spread to other areas of the body:

  • Occult (hidden) stage: cancer cells are found in sputum or other fluids from the lung, but the cancer isn’t seen in other tests.
  • Stage 0 (carcinoma in situ): the cancer is in the top layers of cells lining the air passages. It has not spread to lymph nodes or distant areas of the body.
  • Stages I (divided into IA and IB), II (divided into IIA and IIB) and III (divided into IIIA and IIIB): these involve the cancer increasing in size, and spreading to nearby lymph nodes (stages II and III).
  • Stage IV: the cancer may have spread to the opposite lung, space around the lungs or heart, or other organs, such as bone, liver and brain.

Small cell lung cancer is divided into two stages for the purposes of treatment:

  • Limited stage: the cancer is in only 1 side of the chest (possibly including lymph nodes) and can be treated with a single radiation field.
  • Extensive stage: the cancer has spread widely throughout the lung, to the other lung, to lymph nodes on the other side of the chest or to distant organs.

The staging system used for non–small cell lung cancer is increasingly being used for small cell lung cancer.

Tests to determine the stage of lung cancer can include:

  • imaging tests, including CT scans, PET scans, MRI scans and bone scans
  • pulmonary function test, to see how well the lungs are working
  • mediastinoscopy and mediastinotomy
  • lymph node biopsy
  • bone marrow aspiration and biopsy
  • blood tests, to provide a complete blood count and for other laboratory tests.
  • Last Updated
  • Relevant Links
updated: 10 November 2022 - 2:08pm
Getting the best advice and care: A guide for those affected by lung cancer
Delivering Best Practice Lung Cancer Care: A summary for health professionals
Lung Foundation Australia
Clinical Practice Guidelines for the treatment of lung cancer
Lung cancer - Understanding, Managing, Living
Lung cancer - care pathway
American Cancer Society
National Cancer Institute (US)
National Comprehensive Cancer Network (US)
Lung Cancer Framework
Lung Cancer Framework – At a Glance

Related information

What is cancer?
What is cancer?

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Treatment and side effects
Treatment and side effects

The treatment that your doctors recommend will depend on the type of cancer you have, how advanced it is, and other personal factors.

Living with cancer
Living with cancer

A diagnosis of cancer marks the beginning of a journey full of emotional, psychological, physical and practical challenges.

Life after cancer
Life after cancer

While looking forward to finishing their cancer treatment and getting on with life, for some people, the end of treatment can also be a confusing or worrying time.

A-Z List of Cancer Types

Information on more than 70 types of cancer

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About Cancer Australia

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