Docosahexaenoic acid (omega-3, DHA)
Omega fatty acidsAlso known as: DHA, fish oil DHA, omega
DHA is a structural omega-3 fatty acid essential for brain, eye, and nerve function.
It is abundant in neuronal membranes and supports cell signaling.
Why this matters
Adequate DHA levels improve cognitive performance, visual acuity, and heart health. Low DHA is linked to inflammation, neurodegeneration, and mood disorders.
How this connects to other biomarkers
- Docosahexaenoic Acid is the principal omega-3 in brain and retinal phospholipids and contributes substantially to the Omega-3 Index.
- Low DHA with low Eicosapentaenoic Acid (20:5, EPA) and a low Omega-3 Index raises cardiovascular and cognitive risk; supplementation directly raises both DHA and EPA.
- Elevated DHA with normal EPA suggests algae- or supplement-derived intake rather than fish.
How often should I test Docosahexaenoic acid (omega-3, DHA)?
Most adults benefit from yearly DHA 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.
Note: DHA reflects months of intake; sustained supplementation or fatty fish intake takes 3 to 4 months to fully reflect in membranes. After dietary or supplement changes, wait 3 to 4 months before retesting for the new steady state.
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