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Arterial Oxygen Content

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SaO2:
  Hgb: g/dL      PaO2: mmHg

Background:

Arterial oxygen content  (equation) =
(Hgb x 1.36 x SaO2) + (0.0031 x PaO2)

SaO2 = % of hemoglobin saturated with oxygen 
(Normal range: 93-100%)

Hgb = hemoglobin  
Normal range(Adults): Male: 13-18 g/dl  Female: 12-16 g/dl

PaO2= Arterial oxygen partial pressure
(Normal range: 80-100)

CaO2: Directly reflects the total number of oxygen molecules in arterial blood (both bound and unbound to hemoglobin)
Arterial Oxygen Content – Oxygenation equation