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Residual volume (RV) upper limit of normal plotted as a percentage of the predicted value. Residual volume (RV) upper limit of normal plotted as a percentage.

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Presentation on theme: "Residual volume (RV) upper limit of normal plotted as a percentage of the predicted value. Residual volume (RV) upper limit of normal plotted as a percentage."— Presentation transcript:

1 Residual volume (RV) upper limit of normal plotted as a percentage of the predicted value.
Residual volume (RV) upper limit of normal plotted as a percentage of the predicted value. Height and age of white subjects enrolled in the National Health and Nutrition Examination Survey III study were used to calculate the predicted RV and its upper limit of normal, using the European Community for Coal and Steel equations. All values fall above 120% of predicted, a value frequently used as the upper limit of normal when assessing air-trapping. (Unpublished data from Phillip H Quanjer, used with permission.)‏ Gregg L Ruppel Respir Care 2012;57:26-38 (c) 2012 by Daedalus Enterprises, Inc.

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