Chloride blood test
In short
A typical adult chloride result is 98 to 107 mmol/L. A mildly high chloride often goes with diarrhea or IV fluids. It means more when CO2 is low at the same time. Always read your result against the range printed on your own report.
A mineral salt (electrolyte) that works with sodium to balance fluids.
Chloride moves with sodium to keep body fluids in balance. It also helps keep the blood's acid level steady. Doctors read it with sodium and CO2 (bicarbonate) rather than on its own.
Is my Chloride high or low?
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Typical range
| For | Range | Unit |
|---|---|---|
| Adults | 98–107 | mmol/L |
Typical ranges for adults. Labs differ a little, so the range printed next to your result is the one to go by.
If your Chloride is high
A mildly high chloride often goes with diarrhea or IV fluids. It means more when CO2 is low at the same time.
Common reasons
- Diarrhea, which drains bicarbonate and leaves chloride higher
- Salt-water drips (IV fluids) in the hospital
- Some medicines, including some used for glaucoma
- Less often: kidneys that do not clear acid well
If your Chloride is low
A low chloride often follows vomiting or water pills. It usually moves together with low sodium or high CO2.
Common reasons
- Vomiting, which loses stomach acid
- Water pills (diuretics)
- Heavy sweating
- Less often: heart failure or long-term lung disease
What can throw it off
Salt-water drips (IV fluids) in the hospital can raise chloride for a while.
Questions to take to your appointment
- 1Do my sodium and CO2 point the same way?
- 2Could fluids, vomiting or my medicines explain it?
Read together with
Doctors rarely read Chloride alone. These usually sit next to it.
Quick answers
What is the chloride blood test?
Chloride: A mineral salt (electrolyte) that works with sodium to balance fluids. Chloride moves with sodium to keep body fluids in balance. It also helps keep the blood's acid level steady. Doctors read it with sodium and CO2 (bicarbonate) rather than on its own.
What is a normal chloride level?
For most adults, chloride is typically 98 to 107 mmol/L. Labs differ a little, so the range printed next to your result is the one to go by.
What does a high chloride mean?
A mildly high chloride often goes with diarrhea or IV fluids. It means more when CO2 is low at the same time. Common reasons include diarrhea, which drains bicarbonate and leaves chloride higher; salt-water drips (IV fluids) in the hospital; some medicines, including some used for glaucoma; and less often: kidneys that do not clear acid well. A doctor reads it together with your other results and how you feel.
What does a low chloride mean?
A low chloride often follows vomiting or water pills. It usually moves together with low sodium or high CO2. Common reasons include vomiting, which loses stomach acid; water pills (diuretics); heavy sweating; and less often: heart failure or long-term lung disease.
What can affect my chloride result?
Salt-water drips (IV fluids) in the hospital can raise chloride for a while.
What should I ask my doctor about my chloride?
Questions worth taking to the appointment: Do my sodium and CO2 point the same way? Could fluids, vomiting or my medicines explain it?
What this page can’t do
It reads each number on its own.
Doctors read results together — ALT with AST, ferritin with hemoglobin, TSH with free T4. A pattern says more than any single flag.
It doesn't know you.
Your age, your medicines, how you feel and your last result all change what a number means.
It doesn't remember.
Close this page and your results are gone. That's on purpose: nothing was ever sent to us.
We also make Vita: Health Coach, an app for those parts. It reads your whole report with your medicines and history in mind, answers follow-up questions in plain words, and keeps your reports in one place — for you and for the people you look after.
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