Chloride (Cl)
Complete guide to chloride blood testing — normal ranges, causes of abnormal levels, and when to get tested.
What is Chloride?
Chloride is an essential electrolyte that helps maintain proper fluid balance, blood pressure, and pH levels in your body. It's the main negatively charged ion in the fluid outside your cells.
Why is it Important?
Chloride is crucial for:
- Maintaining fluid and electrolyte balance
- Producing stomach acid (hydrochloric acid) for digestion
- Regulating blood pH and acid-base balance
- Transmitting nerve impulses
Normal Ranges
| Group | Range | Unit |
|---|---|---|
| Adult | 96 – 106 | mEq/L |
What Do Abnormal Results Mean?
Low Chloride (Hypochloremia)
Common causes include:
- Prolonged vomiting or diarrhea
- Diuretic medications
- Metabolic alkalosis
- Congestive heart failure
- Addison's disease
- SIADH (syndrome of inappropriate antidiuretic hormone)
High Chloride (Hyperchloremia)
Common causes include:
- Dehydration
- Metabolic acidosis
- Kidney disease
- Diabetes insipidus
- Excessive saline IV fluids
- Respiratory alkalosis
When Should You Get Tested?
Chloride is part of routine electrolyte panels and comprehensive metabolic panels. Your doctor may order it if you have symptoms of electrolyte imbalance, acid-base disorders, or kidney disease.
This information is for educational purposes only and is not a substitute for professional medical advice.
Last reviewed: 2026-02-13