Table 2. Patient's arterial blood gas results on days 3 and 4.
Measurand (reference interval)Day 3Day 4, 11:07 AMDay 4, 11:13 AM
pH (7.35–7.45)7.487.367.38
Pco2,a mmHg (35–45)40.554.752
Po2, mmHg (80–90)56.982.1274
O2 saturation, % (95–100)9298.5b
Base excess, mEq/L (−2 to 2)6.023.8b
Bicarbonate, mmol/L (21.0–28.0)29.929.929.7
CO-Hb, % (0.0–1.4)2.30.8b
Met-Hb, % (0.0–1.0)1.739.067.7
Hb, g/dL (14.0–18.0)12.012.212.2
  • a Pco2, carbon dioxide partial pressure.

  • b For the arterial blood gas sample on day 4 at 11:13 AM, O2 saturation and base excess were not calculated as indicated by the instrument message; CO-Hb was not ordered for this sample.