PFT Tutor is dedicated to providing concise, easy-to-understand tutorials about pulmonary function testing for technologists and others interested in PFTs. Jeffrey Haynes RRT RPFT FAARC has over 30 years experience performing PFTs and managing PFT laboratories. He has published four text book chapters on PFTs and 70+ works in peer-reviewed pulmonary science journals including Chest, Respiratory Care, Annals of the American Thoracic Society, Respirology, European Respiratory Journal and the American Journal of Respiratory and Critical Care Medicine.