<unk>  is indicated for the following reasons: * to diagnose or manage asthma * to detect respiratory disease in patients presenting with symptoms of breathlessness, and to distinguish respiratory from cardiac disease as the cause * to measure bronchial responsiveness in patients suspected of having asthma * to diagnose and differentiate between obstructive lung disease and restrictive lung disease * to follow the natural history of disease in respiratory conditions * to assess of impairment from occupational asthma * to identify those at risk from pulmonary barotrauma while scuba diving * to conduct pre-operative risk assessment before anaesthesia or cardiothoracic surgery * to measure response to treatment of conditions which<unk>  detects * to diagnose the vocal cord dysfunction.
Spirometry
Structured light plethysmography
Post bronchodilator test
Spirometer
Bronchial challenge test
Air displacement plethysmography
Breath analysis
Bronchial brushing