A spirometer is an apparatus for measuring the volume of air inspired and expired by the lungs. Spirometry is a simple test used to understand how well the lungs function by measuring the amount of air inhaled, exhaled and the pace at which this happens.

Spirometry is used to diagnose a host of breathing disorders like Asthma, COPD, etc. It is also used to track recovery from a chronic lung condition. A Spirometer is a device used to perform the Spirometry test. It is also known as Respirometer or Lung Exerciser and measures the volume of air inhaled and exhaled by the lungs.