SERUM/PLASMA Sodium 138 mmol/L ( 135-145 ) Potassium 3.6 mmol/L ( 3.5-5.5 ) Chloride 105 mmol/L ( 95-110 ) HCO3 23 mmol/L ( 22-30 ) Creatinine 65 umol/L ( 64-104 ) (Creatinine) 0.065 mmol/L ( 0.05-0.11) Urea 1.9 mmol/L ( 2.5-8.3 ) eGFR >90 ( SEE-BELOW) Lactate 1.2 mmol/L ( 0.2-1.8 )