Carbon Dioxide (Bicarbonate)
- Sample Type
- Standard
- Fasting
- No
- Unit
- mmol/L
In a Basic Kidney Profile, the Carbon Dioxide test primarily measures the amount of bicarbonate (HCO3-) in the blood. Bicarbonate is an electrolyte that acts as a buffer to maintain the body's pH balance (acid-base balance). The kidneys play a central role in regulating this by excreting or reabsorbing bicarbonate. Abnormal levels are early indicators of metabolic alkalosis/acidosis, kidney dysfunction, or respiratory issues that affect gas exchange.
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Why Context Matters
CO2 levels are highly sensitive to respiratory status and recent physical activity. Factors like prolonged vomiting (loss of acid) or severe diarrhea (loss of base) can cause significant fluctuations that may be misinterpreted as primary kidney disease without a full clinical history.
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 Carbon Dioxide (Bicarbonate):
Official Sources
- Bicarbonate (Total CO2) Test - Testing.comTesting.com
Research & Guidelines
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.
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