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Upright sitting is preferred position for spirometry. The spirometric values in seventy five adult patients with obstructive lung function in sitting versus standing position were compared. The forced vital capacity (FVC) in standing position were marginally more, but no change in forced expiratory volume (FEV 1 ) was observed. The agreement in diagnosing reversibility of obstruction in either position was high.

Comparison of spirometric values in sitting versus standing position among patients with obstructive lung function