Pulmonary function testing, also known as spirometry, is a test used to screen, diagnose, and monitor respiratory diseases such as asthma, chronic obstructive pulmonary disease, and restrictive lung disease.

Pulmonary function tests are a way to measure how well you breathe in and out of your lungs, and how much oxygen is getting into your body. The most common respiratory function tests are spirometry, diffusion studies, and plethysmography. So what do the respiratory function tests mean?

Respiratory function testing, also known as ventilation function testing or spirometry, is a test used to screen, diagnose, and monitor respiratory diseases such as asthma, chronic obstructive pulmonary disease, and restrictive lung disease.