Spirometry – Lungs Check Home Services Spirometry-Lungs Check Book Now A Spirometry test is a type of lung function test. It determines how well your lungs work by measuring how much air goes in to and out of your lungs when you breathe. A Spirometry test is used to diagnose lung and airway diseases, including: Asthma Chronic Obstructive Airways Disease Cystic Fibrosis Pulmonary Fibrosis Spirometry is conducted onsite.