Sodium (na) urine test

A urine test to check sodium levels 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 the progress of diseases of the kidneys or adrenal glands.

Urine sodium can be checked in a single urine sample, but it is more often measured in a 24-hour urine sample. A single urine sample (clean catch) may be taken at a health professional's office or at home. A 24-hour sample is done at home.

In general, there's nothing you have to do before this test, unless your doctor tells you to.

Results are ready in 1 day.

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.