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Understand EPA (Eicosapentaenoic Acid)

EPA (Eicosapentaenoic Acid)

Heart & circulation markers

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

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Updated Jul 13, 2026

What is EPA (Eicosapentaenoic Acid)?

One of the main marine omega-3 fatty acids, measured here as a share of the fatty acids in your blood.

EPA is an omega-3 fatty acid found mainly in oily fish and fish-oil supplements, and this test reports it as a percentage of your total fatty acids. It is often measured alongside DHA and the omega-3 index to get a sense of your omega-3 status. Higher levels generally reflect a diet richer in seafood or supplements, and EPA is studied in heart and inflammation research; it is an optional, extended marker rather than a routine screening test.

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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