Lab test glossary · Other
Chloride: what it means
Also known as: Cl, serum chloride
Chloride is an electrolyte that tracks with sodium and helps maintain fluid and acid-base balance.
What it measures
Chloride is an electrolyte that usually moves in step with sodium and contributes to your body's fluid balance and acidity. It's rarely the star of the show — it's interpreted alongside sodium, potassium, and bicarbonate to round out the electrolyte picture.
Typical range
Often roughly 96–106 mmol/L.
Reference ranges differ between labs and are printed on your own report — always read your result against that range, not a general one.
What a high result can mean
- Dehydration
- Some kidney or acid-base conditions
A high value is a starting point for a conversation, not a diagnosis — many causes are benign or temporary.
What a low result can mean
- Vomiting
- Some diuretics
- Fluid overload
Why the trend matters
Chloride is best read as part of the electrolyte panel and over time, not as a standalone number.
When to talk to your doctor
An isolated mild chloride change usually isn't significant; discuss it with your doctor if it's marked or paired with other abnormal electrolytes.
This page is general education about a common lab test — it isn’t medical advice and can’t interpret your specific result. What a value means depends on your history, symptoms, and the rest of your labs, which is a conversation for you and your clinician.