Vitamins & minerals
Omega-3 Index
LOINC 86003-4 · %
Ranges
Reference range: ≥ 8 %
What it is
The Omega-3 Index is the percentage of EPA and DHA (omega-3 fats) in your red blood cell membranes, reflecting long-term omega-3 status.
Why it matters
It is a stable, well-studied marker linked to cardiovascular health, with higher values generally seen as protective.
What high values can mean
A higher value reflects a good long-term omega-3 intake and is generally considered favourable.
What low values can mean
A lower value reflects limited omega-3 intake over time.
How to improve it
Eating oily fish regularly, or supplementing under guidance, raises the index over a few months.
Food & lifestyle
Salmon, sardines, mackerel, herring and quality fish-oil or algae supplements raise the omega-3 index.
Preparing for the test
Part of a fatty-acid profile; fasting is usually not required — follow your lab's instructions.
When to talk to a doctor
Discuss your omega-3 index with a clinician as part of cardiovascular prevention.
Related markers
Sources
- NIH Office of Dietary Supplements
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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