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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Hypokalemia Causes. Hypokalemia is the medical term for low levels of potassium in the body, and your level is considered low when it falls below 3.6 mEq/L, or milliequivalents per liter. When your level falls below 2.5 mEq/L it can be life-threatening, reports MayoClinic.com.