The most accurate measurement of the body's store of potassium is an arterial blood sample.

Name: The most accurate measurement of the body's store of potassium is an arterial blood sample.
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The most accurate measurement of the body's store of potassium is actually a measurement of the amount of potassium in the cells, which is not typically measured by an arterial blood sample. A more accurate test would be a urine test or a test of the potassium concentration in muscle tissue.

The Most Accurate Measurement of the Body's Store of Potassium