Note that there are 3 separate flow-volume loops all superimposed on one graph. This is typical for office spirometry. A patient may be normal by comparison to one database but be mildly or . Such problems may not be readily distinguishable by spirometry, but a special physiologic test, the flow-volume loop can be helpful in their differen-tiation. The flow-volume loop is merely one . Spirometry Interpretation 1. Determine if the flow-volume loop appears acceptable 2. Determine if the patient is