Pulmonary stress tests are done while you are exercising to see how well your lungs are working.
Spirometry readings are first done while you are resting. Readings are then taken again following exercise. Spirometry measures how well you can move air in and out of your lungs. It can be done at your health care provider's office or at home with a small handheld spirometer. The spirometer is used to measure:
FEV1 or Forced Expiratory Volume1 (the amount of air you can forcefully breathe out in the first second of forcefully breathing out).
FEV6 or Forced Expiratory Volume6 (the amount of air you can forcefully breathe out after 6 seconds).
These are good tests of Forced Vital Capacity (FVC), which is the