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Tests and diagnosis
By Mayo Clinic staff
To determine if you have emphysema, your doctor is likely to recommend certain tests, including:
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Spirometry and other pulmonary function tests (PFTs). These noninvasive tests can detect emphysema before you have symptoms. They measure how much air your lungs can hold and the flow of air in and out of your lungs. They can also measure how well your lungs deliver oxygen to your bloodstream.
During a spirometry, you're usually asked to blow into a simple instrument called a spirometer. PFTs may be done before and after the use of inhaled medications to test your response to them. If you're a smoker or a former smoker, ask your doctor about taking these tests, even if you don't have symptoms of emphysema or COPD.
- Arterial blood gases analysis. These blood tests measure how well your lungs transfer oxygen into, and remove carbon dioxide from, your bloodstream.
- Pulse oximetry. This test involves the use of a small device that attaches to your fingertip. The oximeter measures the amount of oxygen in your blood differently from the way it's measured in a blood gas analysis. To help determine whether you need supplemental oxygen, the test may be performed at rest, during exercise and overnight.
- Chest X-ray. A chest X-ray can help confirm a diagnosis of emphysema and rule out other causes of shortness of breath, but an X-ray alone isn't enough to make an accurate diagnosis.
- Sputum examination. Analysis of cells in what you cough up (sputum) can help determine the cause of some lung problems.
- Computerized tomography (CT) scan. A CT scan can allow your doctor to view your internal organs, where they'll look for the characteristic "holes" or bullae that are caused by emphysema.
- Emphysema. American Lung Association. http://www.lungusa.org/site/apps/nlnet/content3.aspx?c=dvLUK9O0E&b=2060053&content_id={39330D56-C0E9-4D08-B98F-18EA7B3C410B}¬oc=1. Accessed March 4, 2009.
- Chronic obstructive pulmonary disease (COPD) fact sheet. American Lung Association. http://www.lungusa.org/site/apps/nlnet/content3.aspx?c=dvLUK9O0E&b=2058829&content_id={EE451F66-996B-4C23-874D-BF66586196FF}¬oc=1. Accessed March 4, 2009.
- What is COPD? National Heart Lung and Blood Institute, National Institutes of Health. http://www.nhlbi.nih.gov/health/dci/Diseases/Copd/Copd_WhatIs.html. Accessed March 4, 2009.
- Celli BR. Update on the management of COPD. CHEST. 2008;133:1451.
- Bruce ML, et al. COPD: Your role in early detection. The Nurse Practitioner Journal. 2007;32:25.
- Corbridge SJ, et al. Chronic obstructive pulmonary disease. AAOHN Journal. 2007;55:181.
- Rennard SI. Chronic obstructive pulmonary disease: Definition, clinical manifestations, diagnosis, and staging. http://www.uptodate.com. Accessed March 4, 2009.
- Weiss ST. Chronic obstructive pulmonary disease: Risk factors and risk reduction. http://www.uptodate.com. Accessed March 4, 2009.
- Ferguson GT et al, Management of stable chronic obstructive pulmonary disease. http://www.uptodate.com. Accessed March 4, 2009.
- Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease. Global initiative for Chronic Obstructive Lung Disease. Medical Communications Resources, Inc. Accessed March 20, 2009.
