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- A potassium blood test measures the amount of potassium in your blood. Potassium is a type of electrolyte. Electrolytes are electrically charged minerals that help control fluid levels and the balance of acids and bases (pH balance) in your body.
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- 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.
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