A sodium test measures the amount of sodium in your blood. Sodium is one of several elements in blood called electrolytes. You may already be familiar with sodium as sodium chloride, or table salt. The test is sometimes called a serum sodium test.
The level of sodium in your blood is usually measured with several other blood factors to look for certain diseases. The test can be helpful in evaluating problems with the kidneys, adrenal glands, digestive system, muscles, and nerves.
This test may also be done to check certain medical treatments. Some medicines can cause the body's sodium level to go up or down.
A small amount of blood is taken from your arm with a needle. The blood is collected in tubes and sent to a lab.
Having this test will take just a few minutes.
Ask your health care provider when and how you will get the result of your test.
The normal blood sodium range for adults in most labs is 135 to 145 milliequivalents (mEq) per liter. The normal range may vary slightly from lab to lab. Normal ranges are usually shown next to your results in the lab report.
Your blood level of sodium may be higher than normal because:
Your blood level of sodium may be lower than normal because:
Some medicines can affect the test results, such as diuretics (water pills).
Test results are only one part of a larger picture that takes into account your medical history and current health. Sometimes a test needs to be repeated to check the first result. Talk to your healthcare provider about your result and ask questions.
If your test results are not normal, ask your healthcare provider: