Advanced Patient Assessment Practice Exam

What is the normal value for CaO2?

1. 12-16 vol%

2. 8-12 vol%

3. 4-8 vol%

4. 16-20 vol%

The correct answer is: 16-20 vol%

The normal value for CaO2, or arterial oxygen content, is primarily defined by the amount of oxygen bound to hemoglobin and the amount of oxygen dissolved in plasma. The typical reference range for CaO2 is 16-20 volume percent (vol%). This range reflects the adequate oxygen transport capabilities of healthy arterial blood, ensuring that tissues receive an appropriate supply of oxygen for metabolic processes. CaO2 can be calculated using the formula that includes hemoglobin concentration, saturation of hemoglobin with oxygen, and the partial pressure of oxygen. In normal physiological conditions, the presence of sufficient hemoglobin and optimal oxygen saturation levels maintain CaO2 within this expected range. Values falling outside this range could indicate various pathophysiological conditions related to either decreased hemoglobin levels or impaired oxygen saturation, which can lead to hypoxemia and tissue hypoxia. Other ranges provided in the options, such as 12-16 vol%, 8-12 vol%, and 4-8 vol%, represent either low oxygen transport capabilities or insufficient oxygen content, which would be inconsistent with healthy bodily function. Understanding the normal range of CaO2 is crucial for assessing patient oxygenation status and ensuring adequate therapeutic interventions can be initiated if needed.