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. 2010 Feb 11;108(5):1052–1060. doi: 10.1152/japplphysiol.00904.2009

Table 1.

A summary of methods and assumed values for estimating DmCO and Vc

Method 1/θCO DmCO 1/θNO
1) Roughton-Forster (RF) (0.93 + 0.0052 alveolar Po2) · (14.6/Hb) Calculated using θCO at 2 alveolar Po2 levels Not used
2) NO-CO (0.93 + 0.0052 alveolar Po2) · (14.6/Hb) = DlNO/2.34 0
3) NO-CO (0.93 + 0.0052 alveolar Po2) · (14.6/Hb) = DlNO/2 0.222

Vc, pulmonary capillary blood volume; θ, rate at which gas [carbon monoxide (CO) or nitric oxide (NO)] combines with erythrocytes; DmCO, alveolar membrane conductance of CO.