Spirometry is a pulmonary function test that determines how well the lungs are working. It may be done on a routine basis.

Indications for Spirometry

How is Spirometry performed?

During spirometry you take a very deep breath and blow out as fast and hard as you can. Several attempts are made to assure that the best performance has been measured. Sometimes it is also performed after breathing in a bronchodilator.


What does spirometry show?

Spirometry indicates if there is a problem in lung function. It also determines if  the disease causes an obstructive abnormality (chronic bronchitis, asthma, bronchiectasis) or a restrictive abnormality (pulmonary fibrosis, pneumoconioses, sarcoidosis etc).

Spirometry normal, copd, asthma

Patterns of lung diseases resulting from spiromerty

Which are the most commonly measured parameters?

  • FVCforced vital capacity, the total amount of air that can be blown
  • FEV1- forced expiratory volume in one second
  • FEF25-75– forced expiratory flow between 25% and 75% of the vital capacity