Myeloperoxidase (MPO) Unit Converter

Myeloperoxidase (MPO) is an enzyme found inside white blood cells, mainly neutrophils and monocytes. It plays a key role in your immune system's ability to kill bacteria and other pathogens.

When white blood cells are activated during infection or inflammation, MPO is released and generates powerful oxidants such as hypochlorous acid. These oxidants help destroy invading microorganisms.

As a blood test, MPO is measured as a marker of vascular inflammation and oxidative stress. Elevated levels indicate increased white blood cell activation and may signal a higher risk of cardiovascular disease.

MPO is produced and stored in the granules of neutrophils (the most abundant type of white blood cell) and, to a lesser extent, in monocytes. It is released into the bloodstream when these cells are activated during infection, inflammation, or tissue injury.