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This book serves as a unique, comprehensive resource for physicians and scientists training in pulmonary medicine and learning about pulmonary function testing. Pulmonary function testing and the physiological principles that underlie it are often poorly understood by medical students, residents, fellows and graduate students training in the medical sciences. One reason is that students tend to get overwhelmed by the basic mathematical descriptions that explain the working of the respiratory system and the principles of pulmonary function testing. Another reason is that too many approaches focus on the math without explaining the clinical relevance of these principles and the laboratory testing that enables us to measure the very lung function that these principles are describing. This book answers that need by providing a series of chapters that guide the reader in a natural order of learning about the respiratory system. In particular, after a generaloverview of the structure-function design of the lung and the history of pulmonary function testing, authors begin with the drive to breathe, and then follow the pathway of air as it is drawn into the lung, undergoes gas exchange, and is then exhaled back out again. Each chapter focuses on the key principles and corresponding pulmonary function tests that explain each step in this pathway. Each chapter is written by at least two experts, one with expertise in the underlying physiology, and the other with expertise in the clinical testing and application of pulmonary function testing in practice. Many figures and tables highlight key points, and multiple case studies in each section provide specific examples of the clinical application of each pulmonary function test. This is an ideal guide to pulmonary function tests for practicing pulmonologists, residents, fellows, and medical students.