Background: In the inpatient setting, serum potassium (K) and magnesium (Mg) are frequently replaced for patients with values within the reference range (generally K 3.5-5.0 mEq/L, Mg 1.3-2.2 mEq/L) to target an arbitrary goal of 4 mEq/L for K and 2 mEq/L for Mg.(1,2) For certain high-risk non-pregnant adults, K and Mg replacement to these [...]