Flow-volume loops are important in diagnosis of obstructive and restrictive pulmonary diseases. The attached image demonstrates the flow-volume loops in case of obstructive and restrictive pulmonary disorders. The normal flow-volume loop is also exhibited for reference. Image via: https://www.drawittoknowit.com/course/pathology/glossary/pathophysiologic-disorder/flow-volume-loops
I am a practioner in the specialty of pulmonary and CCM so this is my specialty. Only thing i would add is if there is a flat side on flow loop is indicates a obstruction and if both sides the location is unknown and it's fully obstructed