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How does urine potassium test differ from a blood test?

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Your potassium level can be different in your urine than it is in your blood. Normally, your kidneys filter it out of your blood and get rid of it when you pee. For example, diabetes or heart medicine can make your blood potassium level high but your urine potassium level low. On the other hand, kidney failure, diarrhea, or too much sweating can do the opposite. That’s why sometimes your doctor needs to test both.

From: What is a Urine Potassium Test? WebMD Medical Reference

SOURCES:

American Association for Clinical Chemistry/Lab Tests Online: “Potassium: The Test.”

Medscape: “Potassium,” “Hyperkalemia,” “Hypokalemia.”

UpToDate: “Clinical manifestations of hyperkalemia in adults,” “Clinical manifestations and treatment of hypokalemia in adults.”

National Adrenal Diseases Foundation: “Primary Hyperaldosteronism.”

Reviewed by Melinda Ratini on February 12, 2018

SOURCES:

American Association for Clinical Chemistry/Lab Tests Online: “Potassium: The Test.”

Medscape: “Potassium,” “Hyperkalemia,” “Hypokalemia.”

UpToDate: “Clinical manifestations of hyperkalemia in adults,” “Clinical manifestations and treatment of hypokalemia in adults.”

National Adrenal Diseases Foundation: “Primary Hyperaldosteronism.”

Reviewed by Melinda Ratini on February 12, 2018

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What is the usual blood potassium level in adults?

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