TABLE 1

Results of arterial blood gases

Parameter	Patient value	Normal range
pH	7.40	7.35–7.45
Carbon dioxide tension, mmHg	36	35–45
Oxygen tension, mmHg	66	85–95
HCO₃⁻, mmol·L⁻¹	22	22–28
Oxyhaemoglobin, %	90.8	70–100
Methaemoglobin, %	0.2	0.0–2.0
Lactate, mmol·L⁻¹	0.7	0.5–2.2