Chhabra et al reported equations that can predict the diffusing capacity and alveolar volume of a North Indian. The authors are from Vallabhbhai Patel Chest Institute, University of Delhi, and the University College of Medical Sciences in India.
Patient selection: North Indian adult, from 18 years to 71 (in males) or 65 (in females)
Parameters:
(1) sex
(2) age
(3) height in centimeters
(4) weight in kilograms
predicted diffusion capacity of carbon monoxide in a male in mL CO per min per mm Hg =
= (0.318 * (height)) - (0.624 * (age)) + (0.00552 * ((age)^2))-7.813
predicted diffusion capacity of carbon monoxide in a female in mL CO per min per mm Hg =
= (0.449 * (height)) - (0.099 * (age)) - 44.15
predicted alveolar volume for a male in liters =
= (0.087 * (height)) - (0.019 * (weight)) - 8.152
predicted alveolar volume for a female in liters =
= (0.068* (height)) - 6.893
predicted DLCO to alveolar volume ratio in a male =
= 7.315 - (0.037 * (age))
