Financial/Nonfinancial Disclosures The authors have reported to CHEST the following: B. L. G. reports a consulting or advisory relationship with AstraZenecaUK Limited, Chiesi Pharmaceuticals Inc, and ARTIQ; speaking and lecture fees from Lung Saskatchewan; Lung Association of Nova Scotia and Prince Edward Island, Vyaire Medical Inc, and MGC Diagnostics Corp; travel reimbursement from Novus Medical Inc; and a patent issued to Hans Rudolph Inc. S. S. reports a consulting or advisory relationship with Chiesi Pharmaceuticals Inc, speaking and lecture fees from Vyaire Medical Inc, and being on the medical advisory board of Ndd technologies. M. R. M. was a coauthor of the 2005 ATS/ERS spirometry standards and the 2005 ATS/ERS pulmonary function test interpretation standards. All three authors coauthored the 2019 ATS/ERS spirometry standards. S. S. and M. R. M. coauthored the 2022 ERS/ATS pulmonary function test interpretation standards.