For most healthy adults, a normal blood oxygen level (oxygen saturation) measured by a pulse oximeter should be between 95% and 100%
. This range indicates that your red blood cells are carrying an adequate amount of oxygen to your body's tissues and organs. If your oxygen level falls below 95%, it is generally considered low and may indicate hypoxemia, which can be a cause for concern
. Levels below 92% often warrant medical attention, and if the oxygen saturation drops to 90% or less, it is considered a medical emergency requiring immediate care
. People with lung diseases such as COPD or pneumonia may have lower normal oxygen levels, and your healthcare provider can specify what levels are acceptable for your condition
. Additionally, factors like high altitude can also lower normal oxygen saturation levels
. In summary:
- Normal oxygen saturation (SpO2): 95% to 100%
- Low oxygen saturation: Below 95%
- Seek medical advice: 93% to 94%
- Emergency level: 92% or lower
For more precise measurement, arterial blood gas (ABG) tests measure oxygen partial pressure (PaO2), with normal values between 75 and 100 mm Hg
. If you are monitoring your oxygen levels at home and notice readings consistently below 95%, especially below 92%, consult a healthcare provider for further evaluation
