Which item is among the most important info to evaluate oxygenation status?

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Oxygenation status is best judged with a direct, continuous measure of how much oxygen is bound to hemoglobin in arterial blood. A pulse oximeter provides a real-time SpO2 reading noninvasively, making it the quickest and most reliable single indicator to detect hypoxemia and to monitor how well oxygen therapy is working. This objective number is easier to trend and act on than other signs.

Mental status can change with many problems beyond oxygen levels and may not reflect oxygenation immediately. Skin signs like cyanosis often appear late and can be misleading, especially in cold environments or with low perfusion. Respiratory rate reflects ventilation (how well you’re moving air in and out) more than the actual oxygen content in the blood, so it isn’t a direct measure of oxygenation. Keep in mind spO2 can be affected by conditions like poor perfusion, cold fingers, movement, nail polish, or certain metal-oxide states, so use it alongside clinical judgment and, when needed, additional tests.