Biomarker education
Sodium: What It Measures & Why People Track It
Also called: Na, Serum sodium
Sodium is an electrolyte that helps regulate fluid balance and is part of most metabolic panels.
General biomarker education — not personalized medical advice. Learn more
Result on your report
IllustrativeSodium
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Range: Low – High
LowReference intervalHigh
What it generally measures
Labs measure the concentration of sodium in blood serum or plasma, which reflects the balance between fluid and sodium intake and loss.
Common units on reports: mmol/L
Why people track it over time
Sodium is usually reviewed with the other electrolytes on the same panel rather than by itself.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
Questions to bring
IllustrativeAsk how sodium compares with potassium, chloride, and CO2 on this report.
Mention hydration, medications, or recent illness your clinician has said may matter.
Related markers
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