Your blood oxygen level, also known as blood oxygen saturation, is a measure of how much oxygen your red blood cells are carrying. It is measured as a percentage, and a normal reading for most people is between 95% and 100%. However, if you have a lung disease such as COPD or pneumonia, your normal oxygen saturation level may be lower. Your healthcare provider will let you know what levels are acceptable for you.

Its important to note that pulse oximeters, which are used to measure blood oxygen levels, are not always accurate. Your actual blood saturation level may be 2% to 4% higher or lower than what the oximeter reads. For a more accurate result, your provider may check your blood oxygen levels with a blood test.

If youre using an oximeter at home and your oxygen saturation level is 92% or lower, you should seek medical attention. 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 youre experiencing any of these symptoms, get immediate medical attention.

Maintaining a blood oxygen level of 95-100% is vital for a healthy heart, brain, and kidneys. If you have a health condition that may affect your blood oxygen levels, speak with a doctor to determine the ideal or realistic level for you.