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Understand Omega-3 Index

Omega-3 Index

Heart & circulation markers

What the test generally measures, and what to ask about it.

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Updated Jul 13, 2026

What is Omega-3 Index?

A measure of how much omega-3 fat (EPA plus DHA) is present in your cells, expressed as a percentage of total fatty acids.

The omega-3 index reflects the combined amount of two marine omega-3 fats, EPA and DHA, and is reported as a percentage of your total fatty acids. It is often used as a longer-term picture of your omega-3 status from diet and supplements. The FDA notes that supportive but not conclusive research shows EPA and DHA may reduce the risk of coronary heart disease, so a higher index is studied in that context; a lower index can simply reflect low intake of oily fish or omega-3 supplements. It is an extended nutrition marker rather than a routine screen.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Official source "Omega-3 Fatty Acids - Health Professional Fact Sheet" NIH Office of Dietary Supplements. ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published; written and independently fact-checked against the cited sources.

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