Chloride

Chloride is a key electrolyte that helps balance body fluids and acid–base status.

Last reviewedJune 16, 2026

Serum

sample type

~5 mL

blood needed

~7 days

results in app

Any time of day

best timing

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On this page

Why test Reference ranges What you'll learn What affects it How testing works Sources FAQ

In short

Chloride is an electrolyte that works closely with sodium to keep the right balance of fluid in your body and to maintain a healthy acid-base balance in your blood.

It moves in and out of cells alongside other electrolytes and is regulated mainly by the kidneys. Most chloride comes from the salt in your diet.

Electrolytes & Hydration

Reviewed against DGKL reference practice.

Why test this?

Chloride is usually measured as part of an electrolyte panel and helps round out the picture of your fluid and acid-base balance. Changes often track with sodium, but a chloride level that moves on its own can point to specific problems.

High or low chloride can be linked to dehydration, kidney issues, or disturbances in acid-base balance such as those seen with prolonged vomiting or some breathing problems. It is most useful read together with the other electrolytes.

What is a normal result?

Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.

Adult reference values as used by Aniva. Ranges are guidance and can vary by laboratory and method.

Group	Normal range
Adults	98 to 107 mmol/L

Sources: Chloride blood test (MedlinePlus, NIH), Mayo Clinic Laboratories: Chloride, Serum (CL) — Reference Values

Your Aniva report reads your result against these values together with your age, sex and the rest of your panel.

Ranges are guidance and vary by lab and assay, aligned with DGKL practice. Always read your result against your own lab's reference interval.

What insights will this test give you?

An added view of your fluid and acid-base balance.
Support for interpreting your sodium and bicarbonate results.
Context your concierge can fold into your wider electrolyte and kidney picture.

What can affect this result?

What can skew the result

Intravenous fluids, some diuretics, and acid-base disturbances shift chloride. Very high blood fats can interfere with some methods. A drip arm sample can distort the reading.

Best interpreted with

Usually read together with sodium, potassium, and bicarbonate as part of an electrolyte panel.

How is this tested?

Sample

Serum

Blood needed

~5 mL

Method

Ion-selective electrode

Best timing

Any time of day

Sources. The evidence behind this

LOINC 2075-0: Chloride in serum or plasma

Mayo Clinic Laboratories: Chloride, Serum

MedlinePlus: Chloride Blood Test

Common questions

What does a chloride result mean in plain terms? It shows how well your body balances fluids and acid to base status. Results are best read with sodium, potassium, and bicarbonate.

Do I need to fast for a chloride test? No. Fasting is not required for chloride; normal hydration is fine unless your clinician advises otherwise.

What can affect my chloride level? IV saline, dehydration, vomiting, diarrhea, diuretics, corticosteroids, and bicarbonate-containing antacids can shift levels temporarily.

How often should I test chloride? It’s checked as needed for symptoms, medication monitoring, or routine panels. Your clinician may recheck to confirm changes or track trends.

How long do results take? Results are usually ready in about 7 days.

What should I discuss with my clinician? Share recent fluids, medications, supplements, and any vomiting or diarrhea. Ask if related tests are needed to clarify the result.

Which Aniva panels include this marker?

Core

Your annual full-body baseline with more than 100 biomarkers, included in your Aniva membership.