Chloride Test
The chloride test measures the level of chloride in a blood serum sample. Chloride is the major negatively charged electrolyte in the fluid outside cells, and it helps balance sodium and regulate hydration.
About this test
Chloride is measured in a 1 mL serum sample using an Ion Selective Electrode method. As the major anion in extracellular fluid, chloride balances sodium to keep fluid electrically neutral and helps regulate hydration and osmotic pressure.
Quest describes chloride measurements as used in evaluating electrolyte and metabolic disorders, such as cystic fibrosis and diabetic acidosis. Chloride also plays a role in the movement of bicarbonate ions across red blood cell membranes as carbon dioxide levels change, which is one reason it is often read alongside other electrolyte results.
Test details
| Quest code | 330 |
|---|---|
| Methodology | Ion Selective Electrode |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
Reference range
98-110 mmol/L
Reference ranges are general guidance. The range printed on your own laboratory report is the one that applies to your result.
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Quest resources
Additional details
What this test looks at
The test reports a single value, the concentration of chloride in serum, measured with an Ion Selective Electrode. Because chloride works together with sodium and bicarbonate to maintain fluid balance, a clinician typically reads it alongside other electrolyte results rather than by itself.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does the chloride test measure?
It measures the concentration of chloride, the major negatively charged electrolyte in extracellular fluid, in a blood serum sample.
How is the sample collected?
The test uses a 1 mL serum sample from a routine blood draw.
Do I need to prepare for this test?
No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.
Why might a clinician order a chloride test?
Quest describes chloride measurements as used in evaluating electrolyte and metabolic disorders, such as cystic fibrosis and diabetic acidosis, often read alongside other electrolyte results.
What does a Chloride test cost without insurance?
$15. Celio Health's price is a flat cash price and insurance is never billed: the required physician's order is included.