SERUM/PLASMA Sodium 139 mmol/L ( 135-145 ) Potassium 3.5 mmol/L ( 3.5-5.5 ) Chloride 102 mmol/L ( 95-110 ) HCO3 27 mmol/L ( 22-30 ) Creatinine 59 umol/L ( 49-90 ) (Creatinine) 0.059 mmol/L ( 0.05-0.09) Urea 4.2 mmol/L ( 2.5-8.3 ) eGFR >90 ( SEE-BELOW)