Calculation Of Residual Volume By Spirometric Data

Abstract

Background: The current practice to measure RV is either by BPG or helium dilution methods which may not be available in all clinics due to their cost. Methods: This paper outlines a method for both direct and indirect calculation of RV via PFT with acceptable sensitivity (81 %, 60% ), specificity (71 %, 94%) and validity (76%, 78%) for obstructive and restrictive lung disease respectively at a much lower cost.

Keywords

• RV: Residual Volume
• BPG: Body Plethysmography
• PFT: Pulmonary Function Test
• FRC: Functional Residual Capacity
• ERV: Expiratory Reserve Volume.