SERUM/PLASMA Sodium 138 mmol/L ( 135-145 ) Potassium 4.6 mmol/L ( 3.5-5.5 ) Chloride 105 mmol/L ( 95-110 ) HCO3 25 mmol/L ( 22-30 ) Creatinine 73 umol/L ( 64-104 ) (Creatinine) 0.073 mmol/L ( 0.05-0.11) Urea 8.0 mmol/L ( 2.5-8.3 ) eGFR >90 ( SEE-BELOW)