Calculation of residual volume by spirometric data

ABSTRACT

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. 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