Learn about blood oxygen levels, their importance, normal oxygen saturation by age, pulse oximeter readings chart, and healthy saturation normal range. Oxygen saturation levels ( SpO2 ) between 95 to 100 percent are considered normal for both adults and children (below 95% is considered abnormal). People over 70 years of age may have oxygen levels closer to 95%. Blood oxygen levels indicate the oxygen levels present in the blood. Learn the normal ranges, chart, and symptoms of low oxygen levels (hypoxemia). Oxygen saturation, or O₂ Sat, is an important vital sign that shows what percentage of a patient’s hemoglobin is carrying oxygen. Hemoglobin, found in red blood cells, picks up oxygen in the lungs and delivers it to the body’s tissues while carrying carbon dioxide back to the lungs to be exhaled.
