A PaO2 test measures partial pressure of oxygen, or PaO2—the oxygen pressure in arterial blood. The PaO2 reflects how well oxygen is able to move from the lungs to the blood. It is often altered by ...

Normal blood oxygen levels for healthy adults are between 95% and 100%. Hypoxemia symptoms include shortness of breath, fatigue, and bluish-colored skin. Some health conditions and exercise can affect ...