arterial oxygen content
Also written as: CaO2 — Arterial Oxygen Content
The total amount of oxygen carried in arterial blood, calculated from hemoglobin concentration and oxygen saturation.
Full Definition
Arterial oxygen content represents the total oxygen-carrying capacity of arterial blood and is calculated using hemoglobin concentration, oxygen saturation, and oxygen partial pressure. In pediatric cardiology, this measurement is crucial for assessing the adequacy of oxygen delivery in patients with cyanotic congenital heart disease or single ventricle physiology. The calculation (CaO₂ = (Hgb × 1.36 × SaO₂) + (0.003 × PaO₂)) helps determine optimal hemoglobin targets and guides management decisions regarding timing of interventions in cyanotic patients.
Usage
Usage note: Often expressed as CaO₂ with subscript notation in formal documentation.
In Context
- "Despite low oxygen saturation, the patient's arterial oxygen content was adequate due to compensatory polycythemia." — Clinical assessment note
- "Arterial oxygen content calculations guided the decision to proceed with staged palliation." — Surgical planning document