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Spirometry is a commonly used pulmonary function test that measures the amount and speed of air a person can inhale and exhale. This test evaluates lung function by recording how much air a person can breathe out in one second (forced expiratory volume in one second, or FEV1) and the total volume of air exhaled (forced vital capacity, or FVC). Spirometry is essential in diagnosing and monitoring conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other respiratory disorders. Spirometry is typically performed when patients present with symptoms like persistent cough, shortness of breath, wheezing, or abnormal findings from other tests or physical exams. It is also used to assess lung function before and after administering bronchodilator medications to determine how responsive the airways are to treatment. Additionally, spirometry can help in evaluating the effectiveness of ongoing treatments for chronic lung conditions and in screening for occupational lung diseases. Complications from spirometry are generally rare and minimal, as the test is non-invasive and involves simply breathing into a mouthpiece connected to a spirometer. Some patients may experience temporary discomfort or fatigue from the effort required during the test. In rare cases, individuals with severe respiratory conditions might experience shortness of breath or dizziness while performing the test. It is crucial for patients to follow any pre-test instructions, such as avoiding heavy meals or certain medications, to ensure accurate results and minimize any potential risks. Overall, spirometry is a valuable diagnostic tool that provides essential information about lung function and helps healthcare providers in diagnosing respiratory conditions, assessing disease severity, and guiding treatment decisions. The test is instrumental in managing chronic respiratory disorders, enabling tailored interventions to improve lung health and overall quality of life.