Forced expiratory maneuvers may aggravate some medical conditions.<unk>  should not be performed when the individual presents with: * Hemoptysis of unknown origin * Pneumothorax * Unstable cardiovascular status (angina, recent myocardial infarction, etc.) * Thoracic, abdominal, or cerebral aneurysms * Cataracts or recent eye surgery * Recent thoracic or abdominal surgery * Nausea, vomiting, or acute illness * Recent or current viral infection * Undiagnosed hypertension
Spirometry
Structured light plethysmography
Post bronchodilator test
Spirometer
Bronchial challenge test
Air displacement plethysmography
Breath analysis
Bronchial brushing