Arterial blood gases Physiology · Respiratory physiology ABG Normal RangespH 7.35 - 7.45pO2 10.6-13.3 kPapCO2 4.7-6.0 kPaBicarbinate 23-28 mmol/LBase excess -2 to +2Note: normal values may change depending on the source. The above are taken from the RCEM learning environment.