TY - JOUR T1 - CALCULATION OF RESIDUAL VOLUME BY SPIROMETRIC DATA TT - JF - MJIRI JO - MJIRI VL - 19 IS - 1 UR - http://mjiri.iums.ac.ir/article-1-415-en.html Y1 - 2005 SP - 49 EP - 51 KW - RV: Residual Volume KW - BPG: Body Plethysmography KW - PFT: Pulmonary Function Test KW - FRC: Functional Residual Capacity KW - ERV: Expiratory Reserve Volume. N2 -  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. M3 ER -