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AA Index – Meaning, Measurement & Optimization

The AA Index describes the ratio of arachidonic acid to EPA in the blood and is an important biomarker for inflammatory processes in the body.

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Things worth knowing about "AA Index"

The AA Index describes the ratio of arachidonic acid to EPA in the blood and is an important biomarker for inflammatory processes in the body.

What is the AA Index?

The AA Index (also known as the AA/EPA ratio) is a laboratory value that describes the ratio of the fatty acid arachidonic acid (AA) to the fatty acid eicosapentaenoic acid (EPA) in the blood. Both fatty acids belong to the group of polyunsaturated fatty acids but have opposing effects on inflammatory processes in the body. The AA Index is used to assess an individual's inflammatory risk profile.

The Role of Arachidonic Acid and EPA

Arachidonic acid (AA) is an omega-6 fatty acid that serves as a precursor for pro-inflammatory signaling molecules called eicosanoids. Elevated AA levels in the blood can promote chronic low-grade inflammation.

Eicosapentaenoic acid (EPA), on the other hand, is an omega-3 fatty acid that produces anti-inflammatory mediators, acting as a natural counterbalance to arachidonic acid. EPA is primarily obtained through fatty fish consumption or omega-3 supplements.

How the AA Index is Calculated

The AA Index is calculated as the ratio of the concentration of arachidonic acid to EPA, measured in red blood cells or blood plasma:

Formula: AA Index = AA concentration / EPA concentration
A low value (e.g., below 3) is considered favorable and indicates a balanced fatty acid ratio.
A high value (e.g., above 10–15) suggests an elevated inflammatory risk.

Clinical Relevance

An elevated AA Index is associated with several chronic conditions, including:

Cardiovascular diseases (e.g., atherosclerosis)
Chronic inflammatory diseases such as rheumatoid arthritis or inflammatory bowel disease
Metabolic syndrome and type 2 diabetes
Neurological disorders and depression

In preventive and nutritional medicine, the AA Index is therefore used as a valuable biomarker to identify chronic inflammatory risk at an early stage and to initiate appropriate therapeutic interventions.

Diagnosis and Measurement

The AA Index is determined through a blood test in which the fatty acid composition of red blood cells (erythrocytes) or blood plasma is analyzed. The measurement is performed in specialized laboratories and is part of extended fatty acid profiling panels.

Treatment and Optimization

An elevated AA Index can be reduced through targeted dietary and lifestyle changes:

Increase omega-3 intake: regular consumption of fatty fish (salmon, mackerel, herring) or supplementation with omega-3 preparations (EPA/DHA)
Reduce omega-6 intake: limit sunflower oil, safflower oil, and highly processed foods
Anti-inflammatory diet: Mediterranean-style diet rich in vegetables, fruits, legumes, and olive oil
Regular monitoring: track the AA Index throughout nutritional therapy to evaluate progress

References

Simopoulos, A.P. (2002). The importance of the ratio of omega-6/omega-3 essential fatty acids. Biomedicine & Pharmacotherapy, 56(8), 365–379.
Calder, P.C. (2006). n-3 Polyunsaturated fatty acids, inflammation, and inflammatory diseases. The American Journal of Clinical Nutrition, 83(6), 1505S–1519S.
World Health Organization (WHO): Diet, Nutrition and the Prevention of Chronic Diseases. WHO Technical Report Series, No. 916. Geneva, 2003.

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