Arterial Blood Gas Normal Lab Values

Abbreviation Description Normal Lab Value
PaO2 partial pressure (P) of 70 to 100 mm
oxygen (O2) in the
arterial blood (a)

SaO2 percentage of available ³94.5%
hemoglobin that is
saturated (Sa) with
oxygen (O2)

PaCO2 partial pressure (P) of males: 35 to 48 mmHg
carbon dioxide (CO2) in females: 32 to 45 mmHg
the arterial blood (a)

pH an expression of the extent 7.35 to 7.45
to which blood is
alkaline or acidic

HCO3 the level of plasma 22.0 to 26.0 mEq/L
bicarbonate; an
indicator of the
metabolic acid-base
status

O2Hb oxyhemoglobin ³94.5%
COHb carboxyhemoglobin < 1.5%
HHb deoxyhemoglobin < 2.0%
MetHb methemoglobin < 1.5%

etHb concentration of total males: 14.0 to 18.0 g/dL
hemoglobin females: 12.0 to 16.0 g/dL

etO2Hb O2 content of hemoglobin 15 to 23 vol %

P50 partial pressure of O2 at 25.0 to 29.0 mmHg
50% saturation