Patent ID: 7291502

Claim:
A method for performing a non-invasive blood gas test on a patient, comprising the steps of: a) measuring the pH level of the patient's venous blood; b) calculating the level of [H+] concentration (represented in mol per liter) in the patient's venous blood from extrapolating from the following table: pH [H+] in nmol/L 6.8 160 6.9 125 7.0 100 7.1 80 7.2 63 7.3 50 7.4 40 7.5 32 7.6 26 7.7 20 7.8 16 c) measuring the level of serum bicarbonate concentration, [HCO 3 —] (in mEq/liter) in the patient's venous blood; d) calculating the partial pressure (in mm Hg) of carbon dioxide in the patient's venous blood from the following formula: PCO 2 =[H+]×(1/24)×[HCO 3 —]; and e) determining the oxygen saturation level (SO 2 ) of the patient's arterial blood by using a pulse oximeter.