A normal SpO2 level, as measured by a pulse oximeter, typically ranges from 95% to 100% for most adults and children. However, some individuals with chronic lung conditions like COPD or sleep apnea may have normal levels around 90%.
Understanding SpO2
SpO2, or oxygen saturation, represents the percentage of hemoglobin in your blood that is carrying oxygen. Hemoglobin is the protein in red blood cells that transports oxygen throughout your body. A pulse oximeter is a simple, non-invasive device that measures this percentage by shining a light through your fingertip.
Normal Ranges:
- Adults & Children (generally): 95% - 100%
- Older Adults (over 70 years): Approximately 95%
- Lower Ranges: Readings below 95% may indicate a need for further evaluation, particularly if accompanied by other symptoms. Readings below 67% can indicate a serious condition requiring immediate medical attention (cyanosis).
Important Considerations:
- Individual Variation: While the above ranges are typical, individual normal ranges can vary slightly.
- Underlying Conditions: Pre-existing health conditions, such as lung disease, can affect normal SpO2 levels.
- Altitude: SpO2 levels can be naturally lower at higher altitudes due to lower atmospheric oxygen.
Multiple reputable sources confirm this information: Medicinenet.com https://www.medicinenet.com/what_are_blood_oxygen_levels/article.htm, Cleveland Clinic https://my.clevelandclinic.org/health/diagnostics/22447-blood-oxygen-level, Yale Medicine https://www.yalemedicine.org/conditions/pulse-oximetry, and Healthline https://www.healthline.com/health/normal-blood-oxygen-level all corroborate the 95-100% range as a general guideline for healthy individuals.
