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Sodium (Na) in Urine

Risks

There is no chance for problems in collecting a one-time or 24-hour urine sample.

Results

A test for sodium in the urine is a 24-hour test or a one-time (spot) test that checks how much sodium is in the urine. Sodium is both an electrolyte and a mineral.

Normal

The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

Results are ready in 1 day.

Sodium in 24-hour urine collection 1
Adult:

40–220 milliequivalents (mEq)/day or 40–220 millimoles (mmol)/day (SI units)

Children:

41–115 mEq/day or 41–115 mmol/day

Sodium in one-time urine sample 2
Normal:

Greater than 20 milliequivalents per liter (mEq/L)

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.

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

What To Think About

  • Sodium levels can also be measured in a blood test. To learn more, see the topic Sodium (Na) in Blood.
  • Doctors may look at urine sodium and blood sodium levels to see whether conditions or medicines may be causing fluid or electrolyte imbalances. Urine sodium levels are often high when blood levels are low or low when blood levels are high. Urine sodium levels are affected by medicines and hormones.
  • To see whether the body is passing too little or too much sodium in the urine, a value called the fractional excretion of sodium (FENa) can be found by looking at the amounts of sodium and creatinine in blood and urine. In a person with kidney failure, a low FENa may mean less blood flow to the kidneys is causing the kidney failure.

WebMD Medical Reference from Healthwise

Last Updated: September 04, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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