The normal range for blood oxygen level is between 95% and 100% for most people. However, if you have a lung disease such as COPD or pneumonia, your normal oxygen saturation level may be lower. If you live in an area with high elevation, your oxygen saturation levels may also be lower. A healthy blood oxygen level is between 96% and 99% . If your blood oxygen level is below 95%, it is considered low and may put you at risk of hypoxemia. If your home SpO2 reading is lower than 95%, you should call your healthcare provider. If your blood oxygen level is below 88%, it is a cause for concern and you should seek medical attention immediately. Symptoms of low blood oxygen levels include shortness of breath, chest pain, coughing or wheezing, confusion, headache, rapid heartbeat, and a blue discoloration of your nail beds, skin, and mucus membranes. If you experience any of these symptoms, you should get immediate medical attention.