Spirogram vs. Spirometry — What's the Difference?

A graph of respiratory movement

Spirometry (meaning the measuring of breath) is the most common of the pulmonary function tests (PFTs). It measures lung function, specifically the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled.

A recording of breathing made with a spirograph

An instrument for measuring the volume of air entering and leaving the lungs.

(medicine) The measurement of the volume of air that a person can move into and out of the lungs, using a spirometer.

The act or process of measuring the chest capacity by means of a spirometer.