Diagnosis of Restrictive Lung Disease
Checking the FEV1/FVC ratio is one of the major diagnostic procedures. FEV1 is defined as the amount of air that a person's lungs can blow out in one second, whereas FVC is the value that indicates the total air a person's lungs can blow after full respiration. These ratios are higher in people affected by this medical condition. The total capacity and residual volume is also checked. The patient diagnosed with this disorder shows a general decline in the normal values of residual volume and total volume. It is necessary for the total capacity to be less than 80% of its normal value in order to confirm the disorder in the patient. Besides pulmonary function testing, diagnostic procedures such as chest X-rays, CT scan, pulse oximetry, or bronchoscopy might be conducted.