The normal oxygen level in the blood is between 95% and 100% for most people. However, people with chronic lung disease or sleep apnea can have normal levels around 90% . An ideal oxygen level is between 96% and 99% . Its important to note that pulse oximeters are not always accurate, and actual blood saturation levels may be 2% to 4% higher or lower than what the oximeter reads. If a blood oxygen level test result is not normal, it may mean that a person has hypoxemia, which is a lower-than-normal blood oxygen level. A blood oxygen level below 95% is considered low and may put a person at risk of hypoxemia. If a person sees readings at or below 88%, they should seek medical attention immediately.