Bicarbonate (Total CO2)
- Sample Type
- Standard
- Fasting
- No
- Unit
- mmol/L
Total CO2 represents approximately 95% bicarbonate (HCO3-) in the serum, regulated by the kidneys and lungs. It is a vital component of the electrolyte panel to evaluate acid-base balance. It helps identify metabolic acidosis (e.g., diabetic ketoacidosis, renal failure) or metabolic alkalosis (e.g., severe vomiting, diuretic use) and monitors the body's compensatory response to respiratory disorders.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
Sample handling is critical; if a blood tube is left open to air, CO2 can escape, leading to falsely low bicarbonate readings. Results must be interpreted in the context of blood pH and pCO2 (Arterial Blood Gas).
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Bicarbonate (Total CO2):
Official Sources
Research & Guidelines
- PubMed: Bicarbonate (Total CO2) Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
Get Notified When Dr. Babu Is Available