A PaO2 test measures oxygen pressure in arterial blood to help guide treatment for respiratory issues. This test is part of an arterial blood gas (ABG) test, which also measures other components like ...

What Is an Arterial Blood Gas Test (ABG)? An arterial blood gas (ABG) test measures oxygen and carbon dioxide levels in your blood. It also measures your body’s acid-base (pH) level, which is usually ...

Gases are exchanged across a specialized lung surface. The inhaled oxygen is diffused into the blood, and carbon dioxide from the blood is released into the lungs where it is exhaled. Gases are ...