In the DO2 calculation example, what PaO2 value is used (mmHg)?

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Multiple Choice

In the DO2 calculation example, what PaO2 value is used (mmHg)?

Explanation:
The main idea is that DO2 is based on arterial oxygen content (CaO2), which includes two parts: oxygen bound to hemoglobin and dissolved oxygen in plasma. CaO2 = (Hb × 1.34 × SaO2) + (0.003 × PaO2). In typical DO2 calculation examples, the PaO2 value used is 100 mmHg because it represents normal arterial oxygen tension, making the dissolved portion about 0.3 mL/dL (0.003 × 100). This keeps the example aligned with normal physiology and emphasizes how the larger Hb-bound portion drives CaO2. Using 95, 90, or 105 would only slightly alter the dissolved contribution, but 100 mmHg is the conventional reference value.

The main idea is that DO2 is based on arterial oxygen content (CaO2), which includes two parts: oxygen bound to hemoglobin and dissolved oxygen in plasma. CaO2 = (Hb × 1.34 × SaO2) + (0.003 × PaO2). In typical DO2 calculation examples, the PaO2 value used is 100 mmHg because it represents normal arterial oxygen tension, making the dissolved portion about 0.3 mL/dL (0.003 × 100). This keeps the example aligned with normal physiology and emphasizes how the larger Hb-bound portion drives CaO2. Using 95, 90, or 105 would only slightly alter the dissolved contribution, but 100 mmHg is the conventional reference value.

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