Read the instructions associated with your spirometer for more information. Some meters need to be returned to the manufacturer for a repair if the calibration is out. It is considered optimal for spirometric values to be checked on a weekly basis using a biological control (a healthy person working in your team) [3]. Patient positioning: A spirometer is a diagnostic device that measures the amount of air you can breathe in and out and the time it takes you to breathe out completely after you take a deep breath. Spirometry is a test that measures airflow into and out of your lungs. It can help diagnose lung diseases such as COPD, asthma, and restrictive lung disease. Learn how to prepare, what to expect, and how to interpret your results. What is an incentive spirometer ? An incentive spirometer (spy-rom-uh-ter) is a simple, plastic medical device that exercises your lungs. Your healthcare provider may recommend that you use an incentive spirometer after an illness, surgery or an injury to your chest or abdomen.