Spirometry Results 2 Flow/Volume Loops Normal Test Normal Data Set Multiple Efforts Listen Visualize Observe Authored by William A. French. Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN. LessonsIntroductionSpirometry and PFTReasons to Perform SpirometryThe LungsDefinitions & Nornal ValuesMeasurementsMeasuresPerforming a Test 1Performing a Test 2Results 1✓Results 2Interpretation Guidelines 1Interpretation Guidelines 2Degree of SeverityCOPDTry This OneRecommendations Medically reviewed: William A. French