SERUM/PLASMA Sodium 140 mmol/L ( 135-145 ) Potassium 4.2 mmol/L ( 3.5-5.5 ) Chloride 104 mmol/L ( 95-110 ) HCO3 28 mmol/L ( 22-30 ) Creatinine 91 umol/L ( 64-104 ) (Creatinine) 0.091 mmol/L ( 0.05-0.11) Urea 6.8 mmol/L ( 2.5-8.3 ) eGFR 72 ( SEE-BELOW)