Spirometry is a pulmonary function test that measures the amount and speed of air that can be inhaled and exhaled.
You will be asked to hold the tube of a spirometer in your mouth, inhale as much air as possible, then exhale forcefully into the spirometer for six seconds or more.
The spirometer will measure and record the volume of air inspired and expired.
• The tidal volume (TV) is the volume of air breathed in or out during
• The expiratory reserve volume (ERV) the maximum volume of air that can be forcibly expired after a tidal expiration.
• The inspiratory reserve volume (IRV) the volume of air which can be expired over and above a tidal volume.
This test can help diagnose lung diseases such as asthma and cystic fibrosis, and measure the severity of lung problems that prevent you from breathing normally.