How to perform pulmonary function test?

pulmonary function test can be performed through  full assessment of the patient by taking detailed history including FH AND Personal history of any respiratory or medical history and full physical examination include respiratory rate and by inspection palpation and percussion and osculation then investigations which include, chest x-ray examinations, arterial blood gas analysis, and tests of pulmonary function( spirometer,Lung volumes.Maximal respiratory pressures ,Oxygen desaturation during exercise The aim of pulmonary function testing is to identify the severity of pulmonary impairment..Pulmonary function testing has diagnostic and therapeutic roles and helps clinicians in diagnose and assess severity of lung disease.

Test is used to measure the function of the lungs, where it can determine the quantity (size), and speed (flow), the air inhaled and exhaled, and thus helps in the detection of respiratory problems follows cause shortness of breath and some lung diseases, such as asthma, bronchitis and pulmonary emphysema, and pulmonary fibrosis , it is also used before any major surgery in the lung to make sure that the person is not suffering from pulmonary insufficiency during or after, and to do this examination put the forceps on the patient's nose to breathe only through a tube connected to the known as the spirometer machine through the mouth, and then ask him to breathe deeply, then exhales as quickly as possible and with full force in the tube, and the duration of exhalation should be not less than six seconds to be able to machine from working properly, usually the patient repeats this test three times, and the result is the best of the three tests considered are Measurement the function of the lungs.