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 ...

What Is an Anion Gap? The anion gap test measures anion gap (sometimes called serum anion gap) or how much acid is in your blood. Acid levels that are higher or lower than normal can tip your doctor ...

Acid-base balance refers to the levels of acidity and alkalinity your blood needs in order to keep your body functioning. Too much acid in the blood is known as acidosis, while too much alkalinity is ...