Case Presentation: A 77-year-old male with history of hypertension, hyperlipidemia, type 2 diabetes mellitus, and chronic kidney disease (stage 3a) presented with generalized weakness and fatigue. He denied other symptoms, including myalgias, cold intolerance, or oliguria. Laboratory evaluation revealed blood urea nitrogen (BUN) of 56.9 mg/dL, serum creatinine (SCr) of 5.93 mg/dL, and glomerular filtration [...]