In people with mild symptoms are mild. Chest x-ray may not notice any irregularities. So rely on the capacity of the lungs (Spirometry) together, which is the standard way of diagnosing this disease. By providing patients inhale fully and breathed rapidly through Spirometer then measure the amount of FEV1 (Force expiratory volume 1) vs. (FVC / Force vital capacity) is 26/63 * 100 = 41.26
If the measure. the FEV1 / FVC less than 70%, it will make the diagnosis that the patient is asymptomatic
, so we concluded that patients with the wind blowing out in the first second wind to blow it all with less than 70% indicates a blockage. blocking of the airways
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