Glutathione Peroxidase (GPx)

EDTA blood or heparin blood 0.5 ml (whole blood only)

photometry

1 - 2 days

• GPx can only be determined in unclotted EDTA or heparin whole blood samples, because the value is linked to the haemoglobin concentration.
• GPx is an antioxidant.
• As a selenium-containing enzyme, the GPx level indicates the supply of selenium to the animal within the last few weeks. Thus, GPx cannot indiate an acute undersupply of selenium. An oversupply cannot be diagnosed by determining the GPx level.