- Serum potassium level in any of the following categories: For subjects with eGFRcreat of ≥ 45 mL/min/1.73 m^2, serum potassium level of < 3.5 mEq/L or ≥ 5.1 mEq/L; For subjects with eGFRcreat of ≥ 30 mL/min/1.73 m^2 and < 45 mL/min/1.73 m^2, serum potassium level of < 3.5 mEq/L or ≥ 4.8 mEq/L