Spirometry The Lungs Volumes & Capacities The lung can be divided into eight volumes and capacities: Authored by William A. French. Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN. LessonsIntroductionSpirometry and PFTReasons to Perform Spirometry✓The LungsDefinitions & Nornal ValuesMeasurementsMeasuresPerforming a Test 1Performing a Test 2Results 1Results 2Interpretation Guidelines 1Interpretation Guidelines 2Degree of SeverityCOPDTry This OneRecommendationsSign-in to enable progress reports and certificates.