Glutathione Peroxidase (GPx)

EDTA blood or heparin blood 0.5 ml

photometry

1 - 2 days

• GPx can only be determined in unclotted EDTA or heparin whole blood samples, because the value is linked to haemoglobin.
• GPx is an antioxidant.
• As a selenium-containing enzyme, the GPx level indicates the supply of selenium to the animal within the last 2 – 3 weeks. Thus, GPx cannot indiate an acute undersupply of selenium. An oversupply cannot be diagnosed by determining the GPx level.