LAB TEST
Potassium test
This test measures the amount of potassium in the fluid portion (serum) of the blood. Potassium (K+) helps nerves and muscles communicate. It also helps move nutrients into cells and waste products out of cells. Potassium levels in the body are mainly controlled by the hormone aldosterone .
How the Test is Performed
A blood sample is needed. Most of the time, blood is drawn from a vein located on the inside of the elbow or the back of the hand.
How to Prepare for the Test
Many medicines can interfere with blood test results. Your health care provider will tell you if you need to stop taking any medicines before you have this test. DO NOT stop or change your medicines without talking to your provider first.
How the Test will Feel
You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn.
Why the Test is Performed
This test is a part of a basic or comprehensive metabolic panel. You may have this test to diagnose or monitor kidney disease. The most common cause of a high blood potassium level is kidney disease. Potassium is important to heart function. Your provider may order this test if you have signs of high blood pressure or…
Normal Results
The normal range is 3.7 to 5.2 milliequivalents per liter (mEq/L) 3.70 to 5.20 millimoles per liter (millimol/L). Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results. The examples above show the common measurements for results for…
What Abnormal Results Mean
High levels of potassium ( hyperkalemia ) may be due to: Addison disease (rare) Blood transfusion Certain medicines, including angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), the potassium-sparing diuretics spironolactone, amiloride and triamterene, and beta adrenergic blockers…
Risks
If it is hard to get the needle into the vein to take the blood sample, injury to the red blood cells may cause potassium to be released. This may cause a falsely high result.
References
Mount DB. Disorders of potassium balance. 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 17. Patney V, Whaley-Connell A. Hypokalemia and hyperkalemia. In: Lerma EV, Sparks MA, Topf JM, eds. Nephrology Secrets. 4th…
This is a summary. Read the full article at www.ucsfbenioffchildrens.org (reviewed 20/06/2023).
This page is general information and is not medical advice. It does not replace a registered doctor, and it is not a prescription or a recommendation to use any medicine or test. Prices are listed prices and may change. Always follow the advice of your doctor or pharmacist.