Normal SpO2 values
When measuring SpO2 levels, it is typical to see values ranging from 94 to 99 percent. However, it is important to note that the results obtained from a pulse oximeter can vary depending on the location from which the measurement is taken. To ensure accuracy, sometimes another finger may be used to confirm the results before they are recorded. Any variations in the SpO2 value could potentially indicate pulmonary or cardiac issues, or even the onset of common cold or pneumonia. If the SpO2 value falls below 90 percent, it may be an indication of acute respiratory failure, in which case the patient may require supplemental oxygen. Additionally, if there is a variation of 3-4% from the patient’s usual recorded value, it is recommended to further investigate the cause.
Effect of high altitude on SpO2 levels
The impact of increasing altitude on SpO2 readings is significant. At higher altitudes, where the air contains less oxygen, SpO2 measurements are affected. For instance, a person who registers a normal SpO2 level of 98% at sea level may experience a drop to 95% when at an altitude of 5,000 feet. Furthermore, at an altitude of 10,000 feet, the SpO2 level can decrease even further to as low as 90%. While the decrease in SpO2 can be attributed to the change in altitude, it is crucial to note that reduced oxygen levels pose a genuine concern. When SpO2 levels fall below approximately 80%, individuals may start experiencing symptoms of hypoxia, such as disorientation.