Potassium urine test

Urine potassium

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Definition

The potassium urine test measures the amount of potassium in the urine.

How the Test is Performed

After you provide a urine sample, it is tested in the lab. If needed, your health care provider may ask you to collect your urine at home over 24 hours. Your provider will tell you how to do this. Follow instructions exactly so that the results are accurate.

How to Prepare for the Test

Your provider may ask you to temporarily stop taking any medicines that may affect the test results. Tell your provider about all the medicines you take, including:

  • Corticosteroids
  • Nonsteroidal anti-inflammatory drugs (NSAIDs)
  • Potassium supplements
  • Water pills (diuretics)

DO NOT stop taking any medicine before talking to your provider.

How the Test will Feel

This test involves only normal urination. There is no discomfort.

Why the Test is Performed

Your provider may order this test if you have signs of a condition that affects body fluids, such as dehydration, vomiting, or diarrhea.

It may also be done to diagnose or confirm disorders of the kidneys or adrenal glands.

Normal Results

For adults, normal urine potassium values are generally 15 to 40 mEq/L in a random urine sample and 25 to 125 mEq (25 to 125 mmol) per day in a 24 hour collection. Lower or higher urinary levels may occur depending on the amount of potassium in your diet and the amount of potassium in your body.

The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

A higher than normal urine potassium level may be due to:

Low urine potassium level may be due to:

  • Certain medicines, including beta blockers, lithium, trimethoprim, potassium-sparing diuretics, angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), or nonsteroidal anti-inflammatory drugs (NSAIDs)
  • Adrenal glands releasing too little aldosterone (hypoaldosteronism)

Risks

There are no risks with this test.

References

Gharavi AG, Landry DW. Approach to the patient with renal disease. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 100.

Kamel KS, Halperin ML. Interpretation of electrolyte and acid-base parameters in blood and urine. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 24.

Oh MS, Briefel G, Pincus MR. Evaluation of renal function, water, electrolytes, and acid-base balance. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 15.

Seifter JL. Potassium disorders. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 103.

GO

Review Date: 7/13/2025

Reviewed By: Laura J. Martin, MD, MPH, ABIM Board Certified in Internal Medicine and Hospice and Palliative Medicine, Atlanta, GA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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