OSHA publishes guidance on spirometry testing on April 19, 2013

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Spirometry, the most common type of pulmonary function test (PFT), is used to evaluate worker respiratory health in medical surveillance programs and to screen workers for their ability to perform certain tasks. Spirometry results can play a central role in decisions about worker job assignments and personal protective equipment, and in the assessment of exposure-related health effects.
 
To read the entire publication, visit OSHA's publication here.