Biomarker education
Chloride: What It Measures & Why People Track It
Also called: Cl, Serum chloride
Chloride is an electrolyte that helps maintain fluid balance and is reported on metabolic panels.
General biomarker education — not personalized medical advice. Learn more
Result on your report
IllustrativeChloride
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Range: Low – High
LowReference intervalHigh
What it generally measures
Labs measure chloride concentration in blood, which typically moves together with sodium.
Common units on reports: mmol/L
Why people track it over time
Chloride is usually reviewed alongside sodium, potassium, and CO2 rather than as a standalone marker.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
Questions to bring
IllustrativeAsk how chloride relates to sodium and CO2 on this same report.
Mention hydration or recent illness context if your clinician has said it matters for you.
Related markers
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