What Is Chloride in a Blood Test? Normal Range & What It Means
Also known as: Serum chloride, Cl blood test
Chloride is an electrolyte — an electrically charged mineral — that helps your body balance fluids, maintain healthy blood pH, and support nerve and muscle function. It's measured on routine metabolic panels alongside sodium and potassium. A normal blood chloride level is about 96–106 mmol/L; abnormal levels usually reflect changes in hydration, kidney function, or acid-base balance.
Chloride normal range
| Category | Range (mmol/L) |
|---|---|
| Normal (adults) | 96–106 mmol/LSome labs use 98–107 |
| Low (hypochloremia) | < 96 mmol/L |
| High (hyperchloremia) | > 106 mmol/L |
Reference ranges vary by laboratory. Use the range printed on your own report as the definitive comparison.
What high Chloride can mean
- Dehydration
- Kidney problems
- Metabolic acidosis (too much acid in the body)
- Certain medications
What low Chloride can mean
- Excessive vomiting or fluid loss
- Heart failure or fluid overload
- Chronic lung disease affecting acid-base balance
- Certain diuretics
What to do about an abnormal result
- Chloride is rarely interpreted alone — it's read with sodium, potassium, CO2, and the anion gap.
- Mild changes often reflect hydration status and resolve on their own.
- Ask your doctor whether the pattern points to an acid-base or kidney issue.
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Frequently asked questions
What causes high chloride?
High blood chloride (hyperchloremia) is most often caused by dehydration, but it can also result from kidney disease, metabolic acidosis, or certain medications. It's interpreted alongside sodium and bicarbonate (CO2).
Is chloride the same as salt?
Not exactly. Table salt is sodium chloride, so chloride comes largely from dietary salt, but the blood chloride test measures the chloride electrolyte specifically, which plays its own role in fluid and pH balance.
Related biomarkers
Medically reviewed by Antonieta Rueda, MD and Ayham Shneker, MD · Last reviewed July 6, 2026
This article is for informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your lab results.