Test Overview A sodium test checks how much sodium is in the blood. Sodium is both an electrolyte
Most of the sodium in the body is found in blood and lymph hormone adrenal glands
Most foods have sodium naturally in them or as an ingredient in cooking. Sodium is found in table salt as sodium chloride and in baking soda as sodium bicarbonate. Many medicines and other products also have sodium in them, including laxatives, aspirin, mouthwash, and toothpaste.
Low sodium levels have many causes, such as heart failure, malnutrition, and diarrhea.
Other electrolytes, such as potassium, calcium, chloride, magnesium, and phosphate, may be checked in a blood sample at the same time as a blood test for sodium.
Why It Is Done
A sodium blood test is done to:
Check the water and electrolyte balance of the body. Find the cause of symptoms from low or high levels of sodium. Check on the progress of diseases of the kidneys or adrenal glands. How To Prepare
In general, there's nothing you have to do before this test, unless your doctor tells you to.
Load More Information about Sodium (Na) in Blood Test
How It Is Done
A health professional uses a needle to take a blood sample, usually from the arm.
How long the test takes The test will take a few minutes.
Watch How It Feels
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
Risks
There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
Results
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
Many conditions can affect sodium levels. Your doctor will talk with you about any abnormal results that may be related to your symptoms and past health.
High levels High sodium levels (hypernatremia) can be caused by a high-sodium diet or by not drinking enough water and being dehydrated diuretics Cushing's syndrome High sodium levels can also be caused by high levels of the hormone aldosterone (hyperaldosteronism). Low levels Low sodium levels (hyponatremia) can be caused by a lot of sweating, severe vomiting or diarrhea, drinking too much water (psychogenic polydipsia), or poor nutrition. Low sodium levels can also be caused by underactive adrenal glands thyroid gland heart failure cirrhosis cystic fibrosis Related Information
Credits
Current as of: April 30, 2024
