Approach to hyperkalemia Quiz: Ace Your Exams
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A 65-year-old man presents to his primary care physician’s office to follow up on abnormal laboratory results. He previously had a potassium level of 5.6 mEq/L. His past medical history includes type 2 diabetes mellitus and stage 3 chronic kidney disease. The patient’s laboratory studies are listed below. Which of the following is the most likely cause of the previous hyperkalemia and the current laboratory results?
| Laboratory study | Result |
| Potassium | 5.7 mEq/L |
| Bicarbonate | 22 mEq/L |
| Glucose | 202 mg/dL |
| eGFR | 35 mL/min/1.73m2 |
| Creatine kinase | 60 units/L |
| Aldosterone | 8 ng/dL (supine) |
| Renin | 0.1 ng/mL/hr (supine) |
| Serum osmolality | 290 mOsm/kg H2O |
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