Spirometry - The pulmonary function test

Spirometry is the most common type of pulmonary function or breathing test. It is one of the most readily available and useful tests for pulmonary function. It measures the volume of air exhaled at specific time points during complete exhalation by force, which is preceded by a maximal inhalation. The most important variables reported include total exhaled volume, known as the forced vital capacity (FVC), the volume exhaled in the first second, known as the forced expiratory volume in one second (FEV1), and their ratio (FEV1/FVC). The test can play an important role in diagnosing and managing many lung problems. It can help distinguish between diseases with similar symptoms and determine whether the condition is obstructive and/or restrictive.