• Can this test be used in cases of fertility or autoimmune issues?

Yes, the test helps investigate the role of oxidative stress in certain conditions, including fertility disorders and autoimmune diseases.

• Is this test recommended for individuals with specific dietary habits or athletes?

The test can be useful for individuals following restricted diets, those living in regions with selenium-poor soil, and athletes experiencing high levels of oxidative stress from intense training.

Medical Laboratories

Glutathione Peroxidase Activity Test

Assess your body's ability to fight toxins and oxidative stress by measuring glutathione, the primary guardian of your cells, ensuring strong and sustainable immune health.

Trusted medical contentUpdated: 04-09-2026Views: 44LHL-3328

About this service

The glutathione peroxidase (GPx) test measures the activity of this vital intracellular enzyme. GPx acts as one of the body's key antioxidant enzymes, converting hydrogen peroxide and harmful oxidized lipids into water and harmless alcohols using reduced glutathione (GSH) as an electron donor. It protects cells from oxidative damage that contributes to aging and various diseases.

Conditions and notices

Fasting is not required

Fasting for 8-12 hours is required before taking the sample to ensure stable readings.

Blood is drawn into a suitable tube according to the laboratory's requirements (it may be a heparin or EDTA tube to preserve cells).

The sample must be transported to the laboratory quickly and often requires special processing (cell separation) to maintain enzyme activity.

The doctor should be informed about any dietary supplements or medications the person is taking.

Frequently Asked Questions

Short answers to the FAQs published with this service.

• What is the purpose of the Glutathione Peroxidase (GPx) activity test?

The test evaluates the body's antioxidant status and protection against oxidative stress, which is linked to aging and various chronic conditions.

• How is this test related to Selenium levels?

Since Selenium is a key component of this enzyme, a decrease in GPx activity can serve as an early indicator of a Selenium deficiency.

• What symptoms may lead a doctor to order this test?

It may be suggested for symptoms like chronic fatigue, muscle weakness, unexplained hair loss, or poor immunity.

• Is fasting necessary before the GPx test?

Glutathione Peroxidase Activity Test

About this service

What is included?

Conditions and notices

Frequently Asked Questions

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