Results: There is the similarity of values between the results calculated from venous blood gas and arterial blood gas with pH (Diffmean ABG-CAL: 0.017 with LOA - 0.05 - 0.09), pO2 (Diffmean ABG-CAL: 4.84 mmHg with LOA 3.9 to 5.85), and pCO2 (Diffmean ABG-CAL: - 3.43 mmHg with LOA - 4.1 to - 2.77).