Pulmonary Function Testing (Spirometry)
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The pulmonary function test measures lung capacity and efficiency for persons required to perform strenuous cardio-pulmonary tasks or wear a respirator.  PFT's can also help detect respiratory difficulties or diseases, like emphysema.  Individual results are compared to the Knudsen norms, as specified by NIOSH, and include the measurements of:

• Forced Expired Volume at 1 second (FEV-1)
• Forced Vital Capacity (FVC)
• Ratio of (FEV-1/FVC) Predicted

Employees receive an OSHA standardized pulmonary classification for respirator use at the end of the examination.