What this marker measures
Bicarbonate is part of the anion gap calculation, which helps identify the cause of metabolic acidosis. It is always interpreted in the context of the full electrolyte panel and clinical picture.
High or low: what it can mean
High Bicarbonate
High bicarbonate (metabolic alkalosis) can result from prolonged vomiting, diuretic use, or conditions where the body retains too much base. It is usually identified and investigated alongside other electrolytes.
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Low Bicarbonate
Low bicarbonate (metabolic acidosis) suggests the blood may be more acidic than normal. This can occur with poorly controlled diabetes (DKA), kidney disease, severe diarrhea, or other conditions.
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Frequently asked questions
What is Bicarbonate?
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Bicarbonate is the main buffer in the blood that helps maintain acid-base balance. On a standard chemistry panel, CO₂ represents bicarbonate (not dissolved carbon dioxide gas).
What does Bicarbonate measure?
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Bicarbonate is part of the anion gap calculation, which helps identify the cause of metabolic acidosis. It is always interpreted in the context of the full electrolyte panel and clinical picture.
What does high Bicarbonate mean?
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High bicarbonate (metabolic alkalosis) can result from prolonged vomiting, diuretic use, or conditions where the body retains too much base. It is usually identified and investigated alongside other electrolytes.
What does low Bicarbonate mean?
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Low bicarbonate (metabolic acidosis) suggests the blood may be more acidic than normal. This can occur with poorly controlled diabetes (DKA), kidney disease, severe diarrhea, or other conditions.
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Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.