Diagnosis of Occupational Lung Diseases
Occupational lung diseases, like other lung diseases, usually require an initial chest X-ray for diagnosis. Tests that may be needed to determine the type and severity of the lung disease include:

Chest X-ray
A test that takes pictures of internal tissues, bones, and organs.

Pulmonary function tests (PFTs)
These tests help measure the lungs' ability to move air into and out of the lungs. The tests are usually done with special machines that you breathe into.

Bronchoscopy
This test uses a flexible tube called a bronchoscope to view the bronchi (the main airways of the lungs). Bronchoscopy helps diagnose lung problems, look for blockages, take out samples of tissue and/or fluid, and/or to help remove a foreign body. Bronchoscopy may include a biopsy or bronchoalveolar lavage.

Lung biopsy
Taking out a small piece of tissue, cells, or fluid from the lung so they can be examined under a microscope.

Bronchoalveolar lavage
Removing cells from the lower respiratory tract to help identify inflammation and rule out certain causes.

Blood tests
This test measures the amount of carbon dioxide and oxygen in the blood. Other blood tests may be used to look for possible infections and other problems.

Computed tomography scan (CT or CAT scan)
This is an imaging test that uses X-rays and a computer to make detailed images of the body. A CT scan shows details of the bones, muscles, fat, and organs. CT scans are more detailed than regular X-rays. They can be used to diagnose lung diseases, monitor disease progression, and evaluate response to treatment.