Clinical Blood Gas Mixtures- Blood Gas analysis is a complex process that measures pH, pO2, pCO2, and other parameters. Airgas blood gas mixtures provide zero and span calibration for oxygen and carbon dioxide for the determination of pO2 and pCO2 in a blood sample. Results are used to diagnose respiratory problems as well as support many surgical procedures. Blood gas analyses must be fast, accurate and verifiable. Multi-component blood gas mixtures are available in two highly accurate certified levels, Precision Plus and Precision.