REN and Hypokalemia: Biochemical analyses showed hypokalemia (2.3 mmol/L), hypomagnesemia (0.4 mmol/L), hypocalciuria (1.7 mmol/L), moderately increased creatinine (110 μmol/L), eGFR 68 ml/min, no proteinuria, normal urinalysis, modest metabolic alkalosis (HCO3− 29 mmol/L), RAAS activation (renin 50 mIU/L, aldosterone 845 pmol/L), normotension (122/72 mmHg), and normal urinary electrolytes.