Potassium imbalances are frequently encountered during a review of laboratory results as an incidental finding. Low potassium or hypokalemia is reviewed on A4Medicine. The GP is presented what is normal and levels of severity of hypokalemia. The causes of hypokalemia as dietary, redistribution in cells, renal causes, gastrointestinal causes, skin losses and secondary to medication or drug are displayed clearly. The GP may note that the cause is usually obvious from history and diuretics or gastrointestinal losses are the common causes. Following aetiology, the flowchart mentions the symptoms, ECG changes and approach to management of hypokalaemia. Primary care physicians should note that levels less than 2.5 mmol/Lusually require intravenous treatment in hospital.