- Diagnose or manage asthma
- Detect respiratory disease in patients presenting with symptoms of breathlessness, and to distinguish respiratory from cardiac disease as the cause Measure bronchial responsiveness in patients suspected of having asthma
- Diagnose and differentiate between obstructive lung disease and restrictive lung disease
- Follow the natural history of disease in respiratory conditions
- Assess of impairment from occupational asthma
- Identify those at risk from pulmonary barotrauma while scuba diving
- Conduct pre-operative risk assessment before anaesthesia or cardiothoracic surgery
- Measure response to treatment of conditions which spirometry detects
- Diagnose the vocal cord dysfunction.
- Forced expiratory maneuvers may aggravate some medical conditions.
- Spirometry should not be performed when the individual presents with:
- Hemoptysis of unknown origin
- 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
- The basic forced volume vital capacity (FVC) test varies slightly depending on the equipment used.
- Generally, the patient is asked to take the deepest breath they can, and then exhale into the sensor as hard as possible, for as long as possible, preferably at least 6 seconds. It is sometimes directly followed by a rapid inhalation (inspiration), in particular when assessing possible upper airway obstruction. Sometimes, the test will be preceded by a period of quiet breathing in and out from the sensor (tidal volume), or the rapid breath in (forced inspiratory part) will come before the forced exhalation.
- During the test, soft nose clips may be used to prevent air escaping through the nose. Filter mouthpieces may be used to prevent the spread of microorganisms.
|PULMONARY FUNCTION TEST||NORMAL VALUE (95 PERCENT CONFIDENCE INTERVAL)|
|FEV1||80% to 120%|
|FVC||80% to 120%|
|Absolute FEV1 /FVC ratio||Within 5% of the predicted ratio|
|TLC||80% to 120%|
|FRC||75% to 120%|
|RV||75% to 120%|
|DLCO||> 60% to < 120%|
ERV is measured by the device, Bellow's spirometer
- Spirometry measures Tidal volume, IRV,Vital capacity & FEV
- Residual volume Cannot be measured directly with a spirometer
- ERV is measured by the device, Bellow's spirometer
Don't Forget to Solve all the previous Year Question asked on Spirometry