CRP and Hyponatremia: Laboratory investigations demonstrated leukocytosis (20.3×109/L, 90% neutrophils), anemia (hemoglobin 9.5 g/dL), relative lymphopenia (1.5×109/L), hyponatremia (133 mmol/L), and elevated inflammatory markers (CRP (C-reactive protein) 23.9 mg/dL, procalcitonin 2.12 ng/mL).