What's Blood Oxygen and why is it vital? We’ve heard docs and nurses use the time period Blood Oxygen, however will we perceive what it means and why it’s an necessary part of our total health snapshot? It may be easier to understand than you think. Simply put, blood oxygen monitor blood oxygen degree is a measure of how much oxygen purple blood cells are carrying via arteries. The body carefully regulates blood oxygen ranges as a result of maintaining the precise stability of oxygen-saturated blood is significant to your good health. To find out the level of blood oxygen, medical doctors can test in one among two methods. An arterial blood fuel or ABG test requires a small quantity of blood drawn from the radial artery within the forearm. Sometimes the femoral artery within the groin or one other site is used. Blood for an ABG test is taken from an artery while most different blood tests are accomplished on a sample of blood taken from a vein. Drawing blood from an artery allows oxygen and carbon dioxide ranges to be measured before they enter body tissues.