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Spirometry is the most common of the lung function tests. These tests look at how well your lungs work. Spirometry shows how well you breathe in and out. Breathing in and out can be affected by lung diseases such as chronic obstructive pulmonary disease (COPD), asthma, pulmonary fibrosis and cystic fibrosis.
1 If the FVC and the FEV1 are both normal, stop at this stepâthe spirometry test is normal.  If the FVC and/or the FEV1 are decreased, there is a strong possibility of lung disease and you should go on to Step 5.