Medicine Fluid and electrolytes 6023e7d9 Hypokalemia is defined as a plasma potassium concentration of A < 3.5 mmol/L B < 3.6 mmol/L C < 3.7 mmol/L D < 3.8 mmol/L High-Yield Explanation Hypokalemia, defined as a plasma K+ concentration of <3.5 mM, Hyperkalemia is defined as a plasma potassium level of 5.5 mM Ref: Harrison 19e pg: 305