What SpO2 percentage is typically considered the threshold for abnormal values?

• A. 80%
• B. 85%
• C. 90%
• D. 95%

Answer: (C)

The threshold for abnormal SpO2 values is typically considered to be around 90%. This level is significant because it represents the point at which there is a noticeable deficiency in oxygen saturation, which can indicate the onset of hypoxemia. Normal SpO2 values generally range from 95% to 100% in healthy individuals. Values below 90% suggest that the body may not be receiving adequate oxygen, potentially leading to various complications such as organ dysfunction or respiratory failure if not addressed promptly.

Understanding this threshold is important in clinical practice, as it informs health care providers of the necessity for further evaluation and possible interventions for patients who present with lower saturation levels.