Eicosatrienoic acid (omega-3, ETA)
Omega fatty acidsEicosatrienoic acid is an intermediate omega-3 fatty acid formed during the conversion of ALA to EPA.
Also known as: ETA, mead acid, Omega-3
It contributes to anti-inflammatory lipid signaling pathways.
Why this matters
Although present in small amounts, ETA helps regulate inflammation and vascular tone. Higher levels may reflect efficient omega-3 metabolism and support cardiovascular protection.
How this connects to other biomarkers
- Eicosatrienoic Acid is a minor n-3/n-9 metabolite typically interpreted in the context of the full fatty acid panel; isolated changes have limited clinical significance.
How often should I test Eicosatrienoic acid (omega-3, ETA)?
Most adults benefit from yearly eicosatrienoic acid (ETA) testing as part of a fatty acid panel. After a sustained change in diet or supplementation, retest at 3 to 4 months.
At baseline / for screening: Once every 12 months as part of a fatty acid panel. More frequently, every 3 to 6 months, if you're managing a cardiometabolic concern where fatty acids matter.
When monitoring an intervention or change: Retest 3 to 4 months after a sustained change in dietary fat, such as increasing fatty fish, omega-3 supplements (EPA/DHA), or reducing seed oils. Red cell membranes take this long to fully reflect the new intake. Day-to-day variability is minimal, so only sustained dietary patterns shift the picture meaningfully; don't expect quick changes from short-term diet shifts.
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