Sign in →

Test Code CO2 CO2, Total, LAB55


Rate Reaction

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Green-top (lithium heparin) tube

Acceptable: Gold-top serum gel tube or plain red-top tube

Specimen Volume: 0.2 mL of  plasma or serum

Stability: Separated specimens should be analyzed immediately.

Collection Instructions: Tube should be kept capped as much as possible.

Reference Values

21-32 mmol/L

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

The total carbon dioxide content of serum or plasma is a significant indicator of electrolyte dispersion and anion deficit.  Together with pH determination, CO2 measurements are used in the diagnosis and treatment of numerous potentially serious disorders associated with acid-base imbalance in the respiratory and metabolic systems.