Agreement between arterial and venous pCO2, pH and HCO3-
| ABG (Mean) (SD) | VBG (Mean) (SD) | Mean Difference (ABG- VBG) (95% CI) | 95% Limits of agreement | N | |
| pH | 7.40 (0.09) | 7.37 (0.08) | 0.03 (0.02 to 0.04) | -0.54 to 0.11 | 234 |
| HCO3-(mEq/L) | 29.7 (6.3) | 29.7 (6.4) | -0.04 (-0.22 to 0.15) | -2.90 to 2.82 | 232 |
| pCO2 (kPa) | 6.89 (2.40) | 7.63 (2.41) | 1.93 (1.58 to 2.28) | -3.38 to 7.24 | 225 |