Omega-3 index
How much of the fat in your red cells is the omega-3 kind.
Also printed asO3 Index · Omega 3 Index · EPA+DHA Index
What it measures
The share of long-chain omega-3 fats built into your red cell membranes.
Reflects months of intake rather than one meal, and a higher share is associated with lower heart and rhythm risk.
Why it matters for how long you stay well
It is one of the few numbers here that reads your habits over months rather than your morning, and a higher share tracks with better heart and brain ageing.
How it shows up in daily life
It reflects months of eating rather than this week, so it will not move because of one good weekend.
High and low readings
When it reads high
A high share is the favourable direction.
When it reads low
Low oily fish, walnut and flax intake.
What moves it
Daily life
- oily fish such as sardines, mackerel and salmon
- flaxseed, chia and walnuts
- how much fried and processed oil you eat
Common questions
What does Omega-3 Index measure?
The share of long-chain omega-3 fats built into your red cell membranes. Reflects months of intake rather than one meal, and a higher share is associated with lower heart and rhythm risk.
What does a high Omega-3 index result usually mean?
A high share is the favourable direction.
What does a low Omega-3 index result usually mean?
Low oily fish, walnut and flax intake.
What is the usual reference range for Omega-3 index?
A broad adult reference band is 8–12 %. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 8–12 %
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in %
Ageing relevance
4/5
A strong independent predictor of illness and mortality in large cohorts.
Worth knowing
It is measured inside cell membranes, which is why it reports months of eating rather than days.
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