Total omega-6 % optimal range and reference range
Compiled by Alina Radu, founder of Sera, from the published sources below · Last reviewed November 9, 2026
Sera's bands for Total omega-6 %:
- Optimal 28 – 36 %; sufficient 25 – 40 %; out of range below 25 or above 40 %.
Evidence grade: Exploratory index. A calculated or emerging measure that can be useful for reviewing a pattern but has no universally accepted clinical threshold.
Read it as exploratory rather than diagnostic: there is no universally accepted cut-off, so these are Sera's current working bands.
All units
| Unit | Optimal | Sufficient | Out of range |
|---|---|---|---|
| % | 28 – 36 | 25 – 40 | below 25 or above 40 |
What the evidence says
No published threshold exists for total omega-6 as a percentage of red cell fatty acids; the bands reflect typical levels, about 31 to 34% in European and North American cohorts when the individual omega-6 acids are added up, and have no outcome evidence behind them. Dominated by linoleic and arachidonic acid, so it largely restates those figures. Read it as the other half of the omega balance beside the omega-3 percentage; neither number carries much on its own. A high value is not established as harmful: in pooled cohort data higher linoleic acid in blood or tissue went with lower cardiovascular mortality, and arachidonic acid was not linked to higher risk. Which acids a panel sums into the total varies, so compare only within one laboratory.
Assay: Results differ meaningfully between platforms and methods. Compare against the interval printed by the issuing laboratory before acting on a borderline value.
Sources
- Red Blood Cell Fatty Acid Patterns from 7 countries: Focus on the Omega-3 Index — Schuchardt JP, Cerrato M, Ceseri M, et al. — Prostaglandins, Leukotrienes and Essential Fatty Acids, 2022 · Peer-reviewed publicationMean red cell levels measured by one laboratory method in 17 cohorts (Italy, Spain, Germany, Canada, United States, Japan, Korea; 167,347 people). Cohort means only: the paper gives no percentiles or reference interval. The omega-6 means (linoleic 11.1% to 13.8% and arachidonic 13.9% to 16.8% in Western cohorts, plus DGLA, 22:4 and 22:5) sum to about 31 to 34% in European and North American cohorts and 28% in Japan. Shows the optimal band matches typical levels; supports no edge as a threshold.
What Omega-6 Total (% of Total Fatty Acids) measures
The share of every omega-6 fatty acid measured — linoleic, arachidonic, DGLA and GLA together — in total fatty acids.
Dominated by linoleic acid, so it largely restates that one. Its value is as the denominator of the omega balance: a high omega-6% alongside a low omega-3% is the pro-inflammatory pattern, and neither figure says much alone.