Pulmonary function testing is a valuable tool for evaluating the respiratory system, representing an important adjunct to the patient history, various lung imaging studies, and invasive testing such as bronchoscopy and open-lung biopsy.
Insight into underlying pathophysiology can often be gained by comparing the measured values for pulmonary function tests obtained on a patient at any particular point with normative values derived from population studies.
The percentage of predicted normal is used to grade the severity of the abnormality.
often used in clinical medicine for evaluating respiratory symptoms such as dyspnea and cough, for stratifying preoperative risk, and for diagnosing common diseases such as asthma and chronic obstructive pulmonary disease.
Spirometry Spirometry is the most commonly used lung function screening study. Indications for Spirometry Diagnostic
To evaluate symptomsChest pain
To evaluate signsChest deformity
Diminished breath sounds
To evaluate abnormal laboratory testsAbnormal chest radiographs
To measure the effect of disease on pulmonary function
To screen persons at risk for pulmonary diseasesSmokers
Persons in occupations with exposures to injurious substances