Effect of sitting vs standing posture on spirometry in children

Asthma is a common medical condition that affects adults and children. National asthma guidelines (National Institutes of Health) recommend spirometry, a pulmonary function test, as an essential part of the initial diagnosis and follow-up care of asthma. Per the American Thoracic Society, traditionally spirometry is performed with the patient in the sitting posture, but usually it is not documented on the spirometry report. During the past 25 years, the rates of overweight and obesity have increased by 30% to 400% among 2- to 19-year-old.

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