Plasma Total Carbon Dioxide

The total CO2 content is a surrugate for serum bicarbonate levels. The measure includes serum bicarbonate (which accounts for about 95% of tatal CO2) and other forms of carbon dioxide (i.e., dissolved CO2 and carbonic acid).[reference|url=https://pubmed.ncbi.nlm.nih.gov/29339355|title=Re-Evaluation of the Normal Range of Serum Total CO 2 Concentration|published=2018 Feb 7|authors=Jeffrey A Kraut, Nicolaos E Madias|journal=Clin J Am Soc Nephrol|]