Flow-volume loop

A flow-volume loop is a graph that shows how air moves in and out of your lungs during breathing, recorded with a spirometer. It displays the rate of airflow on the Y-axis and the volume of air inhaled or exhaled on the X-axis. The loop helps doctors assess lung function by revealing patterns that indicate conditions like asthma, COPD, or other breathing problems. Typically, it has a distinct shape for normal lungs, while deviations can suggest airway narrowing, obstruction, or restriction. It’s a valuable tool for diagnosing and monitoring respiratory health.