What is the normal oxygen saturation (SpO2) range for a healthy adult?

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Multiple Choice

What is the normal oxygen saturation (SpO2) range for a healthy adult?

Explanation:
SpO2 shows how much of the hemoglobin in arterial blood is carrying oxygen, typically measured noninvasively with a pulse oximeter. For a healthy adult at sea level, the normal range is about 95-100%. This is the best match because it reflects the usual, fully saturated state of arterial oxygen in persons without lung disease. Readings lower than this, especially in the low 90s or below, suggest hypoxemia and should prompt evaluation; values above 100% aren’t physiologically possible. Some chronic lung conditions can have lower baseline values, but in a healthy adult the standard expectation remains 95-100%. Practical note: ensure proper technique and consider factors that can affect the reading, such as poor perfusion, nail polish, or movement.

SpO2 shows how much of the hemoglobin in arterial blood is carrying oxygen, typically measured noninvasively with a pulse oximeter. For a healthy adult at sea level, the normal range is about 95-100%. This is the best match because it reflects the usual, fully saturated state of arterial oxygen in persons without lung disease. Readings lower than this, especially in the low 90s or below, suggest hypoxemia and should prompt evaluation; values above 100% aren’t physiologically possible. Some chronic lung conditions can have lower baseline values, but in a healthy adult the standard expectation remains 95-100%. Practical note: ensure proper technique and consider factors that can affect the reading, such as poor perfusion, nail polish, or movement.

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