Sodium Test - part of the Comprehensive Metabolic Panel

The sodium blood test measures the amount of sodium in the blood.

Sodium can also be measured using a urine test.

How to Prepare for the Test

Your physician may tell you temporarily to stop taking medicines that may affect the test. These include:

Why the Test is Performed

Sodium is a substance that the body needs to work properly. Sodium is found in most foods. The most common form of sodium is sodium chloride, which is table salt.

This test is usually done as part of an electrolyte or basic metabolic panel blood test.

Your blood sodium level represents a balance between the sodium and water in the food and drinks you consume and the amount in your urine. A small amount is lost through stool and sweat.

Many things can affect this balance. Your physician may order this test if you:

Normal Results

The normal range for blood sodium levels is 135 to 145 milliequivalents per liter (mEq/L).

What Abnormal Results Mean

Abnormal sodium levels can be due to many different conditions.

Higher than normal sodium level is called hypernatremia. It may be due to:

Lower than normal sodium level is called hyponatremia. It may be due to:


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Adapted from the U.S. National Library of Medicine, National Institutes of Health

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