Birnbaum S, Barreiro TJ. Methacholine challenge testing: identifying its diagnostic role, testing, coding, and reimbursement (review).
Chang J, Mosenifar Z. Differentiating COPD from asthma in clinical practice.
J Intensive Care Med
Chu MW. Introduction to pulmonary function.
Otolaryngol Clin North Am
Crapo RO, Casaburi R, et al. Guidelines for methacholine and exercise challenge testing (1999).
Am J Respir Crit Care Med
Pulmonary Function Tests (PFTs). Duke University Health System. DukeHealth.org website. Available at:
. Accessed November 12, 2010.
Walsh JM. Interpreting pulmonary function test. Loyola University Medical Education Network website. Available at:
. Accessed October 30, 2006.
American Lung Association
Canadian Lung Association