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.
Lung function tests measure: 1  How much air you can take into your lungs. This amount is compared to that of other people your age, height, and sex. 2  How much air you can blow out of your lungs and how fast you can do it. 3  How well your lungs deliver oxygen to your blood.  How strong your breathing muscles are.