A normal oxygen level for most healthy people, as measured by a pulse oximeter, is between 95% and 100% oxygen saturation (SpO2)
. Levels below 95% are generally considered low and may indicate hypoxemia, which requires medical attention, especially if below 92%
. For people with lung diseases such as COPD, a lower target range of 88% to 92% oxygen saturation is often considered safe, with levels below 88% being dangerous and warranting medical consultation or emergency care if very low
. In arterial blood gas (ABG) measurements, normal oxygen partial pressure (PaO2) ranges from 75 to 100 mm Hg, with values below 75 mm Hg indicating hypoxemia and below 60 mm Hg indicating a critical need for supplemental oxygen
. Summary:
- Healthy individuals: 95% to 100% SpO2 (pulse oximeter)
- COPD or lung disease patients: 88% to 92% SpO2
- Seek medical help if SpO2 < 92%
- Emergency if SpO2 ≤ 90% or PaO2 < 60 mm Hg
These values may vary slightly depending on altitude and individual health conditions, so it is best to consult a healthcare provider for personalized targets
