Hypomagnesemia laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The diagnosis can be made by finding a plasma magnesium concentration of less than 0.7mmol/l. Since most magnesium is intracellular, a body deficit can be present with a normal plasma concentration. In addition to hypomagnesemia, up to 40% cases will also have hypocalcemia while in up to 60% of cases, hypokalemia will also be present.