Medicine Fluid and electrolytes ac77c534 Hypokalemia is A <3.5 B <4.5 C <5.6 D <6.5 High-Yield Explanation Hypokalaemia is a common electrolyte disturbance and is defined as existing when serum K+ falls below 3.5 mmol/L. The main causes of hypokalaemia Ref Davidson 23rd edition pg 363