Alternative Names
  • Carbon Dioxide
  • CO2
  • TCO2

Test Code: 4524

CPT: 82374
Tests Included CO2
Use Routine Check-up. Bicarbonate measurements are used in the diagnosis and treatment of numerous potentially serious disorders associated with changes in body acid-base balance
Clinical Utility Carbon dioxide (CO2) is a gaseous waste product from metabolism. The blood carries carbon dioxide to your lungs, where it is exhaled. More than 90% of it in your blood exists in the form of bicarbonate (HCO3). The rest of it is either dissolved carbon dioxide gas (CO2) or carbonic acid (H2CO3). Your kidneys and lungs balance the levels of carbon dioxide, bicarbonate, and carbonic acid in the blood.

Low Bicarbonate levels may be observed in compensated respiratory alkalosis and metabolic acidosis. An elevation of the Bicarbonate level may be observed in compensated respiratory acidosis and metabolic alkalosis
Intended Patient Population 18+ and Older Adult Males & Females
Patient Preparation None Specified
Sample Serum, Plasma
Tube Red, Green, Tiger
Volume 4mL Whole Blood (1mL Serum/Plasma)
Min Sample Volume 0.1 mLs
Reference Ranges M & F ≥ 18 yrs old; 21-31 mEq/L
Analytical Measurement Range 4-36 mEq/L
Critical Values ≤10 or ≥40 mmol/L
Units mEq/L
Test Methodology Quantitative Enzymatic
Test Turnaround Time 1 Day
Limitations Interpretation requires clinical information and the other electrolytes.
Shipping Requirements Refrigerated
Specimen Stability 3 Days RT
2 Days RF
Reject Criteria Hemolysis
Laboratory Developed Test (LDT) Yes
CMS Guidance None
  1. Tietz Textbook of Clinical Chemistry. Edited by CA Burtis, ER Ashwood. Philadelphia, WB Saunders Company, 1999

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