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Understand DHA (Docosahexaenoic Acid)

DHA (Docosahexaenoic 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 DHA (Docosahexaenoic Acid)?

A key marine omega-3 fatty acid important for cell membranes, reported here as a share of the fatty acids in your blood.

DHA is an omega-3 fatty acid concentrated in the brain, eyes, and cell membranes, and it comes mainly from oily fish and fish-oil or algae supplements; this test reports it as a percentage of your total fatty acids. It is usually looked at together with EPA and the omega-3 index. Higher levels typically reflect greater seafood or supplement intake, and DHA is studied in heart and brain-health research, but it is an optional 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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