Collagen supplements are taken in one of two different forms, either in the form of hydrolyzed collagen or in the form of an undenatured type II collagen; both forms have different dosing strategies and while their benefits may share some similarities can be considered two different supplements.
Other tests, including imaging (see Chest Imaging), bronchoscopy (see Bronchoscopy), and thoracoscopy (see Thoracoscopy), allow doctors to determine the specific cause of a lung disorder.
The two most common pulmonary function tests for asthma are spirometry and methacholine challenge tests. 1  Spirometry: This pulmonary function test for asthma is a simple breathing test that measures how much air you can blow out of your lungs and how quickly. Spirometry: This pulmonary function test for asthma is a simple breathing test that measures how much air you can blow out of your lungs and how quickly.