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Oxidative Stress Index (OSI) – Definition & Significance

The Oxidative Stress Index (OSI) measures the ratio of oxidative stress to antioxidant capacity in the blood and serves as a diagnostic marker for oxidative damage in the body.

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Things worth knowing about "Oxidative Stress Index"

The Oxidative Stress Index (OSI) measures the ratio of oxidative stress to antioxidant capacity in the blood and serves as a diagnostic marker for oxidative damage in the body.

What Is the Oxidative Stress Index?

The Oxidative Stress Index (OSI) is a laboratory value that describes the balance between oxidative stress and the antioxidant defense capacity of the body. It is calculated as the ratio of the Total Oxidant Status (TOS) to the Total Antioxidant Status (TAS). An elevated OSI indicates that the oxidative burden exceeds the body's protective capacity, which can lead to cellular damage.

Oxidative Stress: Background Information

Oxidative stress occurs when reactive oxygen species (ROS) – also known as free radicals – are produced in excessive amounts or when the body's antioxidant defense mechanisms are insufficient to neutralize them. These reactive molecules can damage cell membranes, proteins, lipids, and DNA.

Endogenous sources: Mitochondrial metabolism, immune responses, inflammatory processes
Exogenous sources: Smoking, UV radiation, environmental toxins, unbalanced diet, excessive alcohol consumption

Calculation of the Oxidative Stress Index

The OSI is calculated using the following formula:

OSI = TOS / TAS × 100

Here, TOS represents the total amount of oxidative substances in the blood, and TAS represents the overall antioxidant capacity. The higher the calculated OSI value, the greater the oxidative burden relative to antioxidant protection.

Clinical Significance and Areas of Application

The OSI is used in clinical research and diagnostics to quantify the degree of oxidative stress in various diseases. An elevated OSI has been associated in studies with the following conditions:

Cardiovascular diseases: Atherosclerosis, coronary artery disease, heart failure
Metabolic disorders: Type 2 diabetes mellitus, metabolic syndrome, obesity
Neurological diseases: Alzheimer's disease, Parkinson's disease, multiple sclerosis
Chronic inflammatory diseases: Rheumatoid arthritis, inflammatory bowel disease
Cancer: Various tumor types with altered redox homeostasis
Reproductive medicine: Infertility, preeclampsia during pregnancy

Diagnosis and Measurement

The OSI is determined through a blood test performed in a laboratory. TOS and TAS are measured separately, and the ratio is then calculated. The measurement is usually carried out using serum or plasma. It is a non-invasive, standardized procedure performed in specialized laboratories.

Reference Values

There are no universally standardized reference values for the OSI, as these can vary depending on the measurement method, laboratory, and study population. Clinical interpretation should therefore always be considered in the context of laboratory-specific reference ranges and the overall clinical picture of the patient.

Influencing Factors and Prevention

A balanced ratio between oxidative stress and antioxidant capacity can be positively influenced by various measures:

Diet: Adequate intake of antioxidants such as vitamin C, vitamin E, beta-carotene, selenium, and zinc through fruits, vegetables, and whole grains
Lifestyle: Avoiding smoking, moderate alcohol consumption, protection from UV radiation
Exercise: Regular, moderate physical activity promotes endogenous antioxidant synthesis
Stress management: Chronic psychological stress can increase the production of free radicals
Supplementation: Antioxidant micronutrient supplements may be considered in cases of confirmed deficiency

References

Erel O. - A new automated colorimetric method for measuring total oxidant status. - Clinical Biochemistry, 2005; 38(12):1103-1111.
Sies H. - Oxidative stress: a concept in redox biology and medicine. - Redox Biology, 2015; 4:180-183.
Halliwell B., Gutteridge J.M.C. - Free Radicals in Biology and Medicine. 5th Edition. Oxford University Press, 2015.

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