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Chloride

Electrolytes

ClSerum chloride

Review status

Currently under review

Pending specialist review and validation.

What it shows

Chloride is an electrolyte, a charged mineral that helps maintain the body’s fluid balance and acid–base status. Most chloride is found in the fluid outside cells and works closely with sodium, potassium, and bicarbonate to keep your cells and organs functioning properly.

Clinicians can measure chloride in blood, and in certain situations in other body fluids such as urine, sweat, or cerebrospinal fluid. It is commonly included in basic or comprehensive metabolic panels, and it may also be ordered as a stand‑alone test when there are concerns about hydration, acid–base changes, or specific conditions.

Why it matters

Chloride levels give important clues about your hydration, kidney function, and acid–base balance. Results help your clinician evaluate causes of symptoms like weakness, confusion, vomiting, or breathing changes, and they guide treatment decisions when you are receiving intravenous fluids or diuretics.

The test is used to monitor conditions such as kidney disease, lung disorders that affect carbon dioxide balance, and gastrointestinal losses from vomiting or diarrhea. Sweat or other fluid testing for chloride may be used when investigating specific conditions, such as cystic fibrosis, based on your age, symptoms, and clinical history.

Understanding your results

Your chloride result is interpreted alongside other tests, especially sodium, potassium, bicarbonate, and blood gases. A result outside the expected range does not always mean there is a problem; it may reflect temporary factors like hydration or recent treatments. Your clinician will look at the overall pattern and your symptoms to decide whether any follow‑up is needed.

If your value is higher than expected, common explanations include dehydration, certain types of metabolic acidosis, kidney issues, or receiving saline‑rich fluids. If it is lower, possibilities include vomiting, some diuretics, or metabolic alkalosis. Additional tests, such as urine chloride or anion gap, may be ordered to clarify the cause and guide treatment.

Reference ranges

95 – 100 mmol/L
All sexes
0 days – 1 month
109 – 123 mmol/L
All sexes
0 days – 3 months
99 – 116 mmol/L
All sexes
0 days – 18 years
170 – 250 mmol/d
All sexes
0 days – 150 years
99 – 110 mmol/L
All sexes
1 month – 18 years
113 – 127 mmol/L
All sexes
3 months – 1 year
117 – 131 mmol/L
All sexes
1 year – 12 years
120 – 128 mmol/L
All sexes
12 years – 18 years
116 – 127 mmol/L
All sexes
18 years – 150 years

Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.

Factors that could impact Chloride

  • Hydration and IV fluids

    Dehydration can concentrate chloride, while large volumes of saline‑based intravenous fluids can raise it. Rehydration or switching fluids can normalize levels.

  • Vomiting and diarrhea

    Vomiting often lowers chloride because gastric fluid is rich in chloride, while diarrhea may increase or decrease levels depending on the type and duration of losses.

  • Medications and supplements

    Diuretics, laxatives, corticosteroids, bicarbonate or ammonium salts, and some acid‑suppressing therapies can shift chloride and acid–base balance.

  • Kidney and lung function

    Kidneys and lungs work together to regulate chloride and pH. Kidney disease or chronic breathing disorders can lead to persistent chloride changes.

  • Specimen type and collection

    Chloride can be measured in blood, urine, sweat, or cerebrospinal fluid. Proper collection, timing for urine collections, and avoiding contamination are important.

  • Age, pregnancy, and critical illness

    Normal expectations can differ by age and clinical context. Pregnancy, severe infections, or intensive care treatments may influence chloride results.

2026

References

  1. McGill University Health Centre. (2013, December 04). Chloride (Task CD 1092167). Laboratory reference ranges.
  2. McGill University Health Centre. (2015, April 30). Chloride (Task CD 316186). Laboratory reference ranges.
  3. McGill University Health Centre. (2015, July 02). Chloride (Task CD 316182). Laboratory reference ranges.
  4. McGill University Health Centre. (2015, July 03). Chloride (Task CD 1090349). Laboratory reference ranges.
  5. McGill University Health Centre. (2018, June 13). Chloride (Task CD 6117165). Laboratory reference ranges.
  6. McGill University Health Centre. (2017, May 05). Chloride (Task CD 317698). Laboratory reference ranges.