Formula for 1/θCO | 1/θCO | θNO/θCO | |||
Ideal Hb (14.6 g·dL−1) | Ideal Hb (13.4 g·dL−1) | Ideal Hb (14.6 g·dL−1) | Ideal Hb (13.4 g·dL−1) | ||
Derived in vivo | |||||
Guénard et al. [16] | (0.0062·PAO2+1.16)·(ideal Hb÷measured Hb) | 1.780 | 1.939 | 8.010 | 8.727 |
Derived in vitro | |||||
Forster [4] α=∞, pH=7.4 | (0.0041·PAO2+1.3)·(ideal Hb÷measured Hb) | 1.710 | 1.863 | 7.695 | 8.384 |
Roughton and Forster [11] α=1.5, pH=8.0 | (0.0058·PAO2+1.0)·(ideal Hb÷measured Hb) | 1.580 | 1.721 | 7.110 | 7.747 |
Holland [28] α=1.5 | (0.0065·PAO2+1.08)·(ideal Hb÷measured Hb) | 1.730 | 1.885 | 7.785 | 8.482 |
Numbers given are for the following standards: alveolar oxygen tension (PAO2) 100 mmHg and specific conductance in the blood for nitric oxide (θNO) 4.5 mL NO· (mL blood·min·mmHg)−1 and thus 1/θNO=0.222, from [14, 29]. θCO: specific conductance in the blood for carbon monoxide; Hb: haemoglobin; α: the ratio of permeability of the red cell membrane to that of the red cell interior.