INTERPRETING BLOOD GASES cPaCO 2 = pH SBE = pH cPaCO 2 = pH SBE = pH ‘NORMAL’ BLOOD GASES pH7.35 – 7.45 PaO 2 13kPa PaCO 2 5.3kPa HCO 3 22 – 25mmol/l Base deficit or excess -2 to +2 mmol/l