05/13/2026
Omega-3 Index (O3I) testing measures the percentage of EPA and DHA—the two most well studied omega-3 fatty acids found within red blood cell membranes. Unlike a standard fatty acid test, the Omega-3 Index reflects long term omega-3 status over the previous several months and provides insight into cardiovascular, brain, inflammatory, and recovery health.
Clinical experience and research in the U.S. shows that a large percentage of most individuals fall below the optimal range, often due to low intake of fatty fish and increased consumption of processed omega-6-rich foods. Low omega-3 levels have been associated with increased inflammation, slower recovery, poorer cardiovascular health, and impaired cognitive performance.
An Omega-3 Index of 8% or greater is generally considered optimal for overall health, but emerging research suggests athletes may benefit from even higher levels due to increased oxidative stress, inflammation, and recovery demands associated with intense training. Although specific cut-off guidelines for athletes have not been universally established, current research suggests a target range of approximately 8–11% may be ideal for supporting performance, recovery, cardiovascular function, and resilience.
One important thing to understand is that a high fish intake or regular fish oil supplementation does not always mean your omega-3 levels are actually optimal. Quality matters. Absorption matters. And getting enough EPA and DHA for your specific goals matters. Some fish oil supplements contain lower-quality oils, inadequate EPA/DHA amounts, or oxidized fats that may not produce meaningful changes in Omega-3 Index levels.
Interestingly, populations in Japan—where fish intake is traditionally much higher have consistently demonstrated lower cardiovascular risk and significantly higher omega-3 levels compared to Western populations (PMID: 16401768).
The takeaway? Don’t assume. Test.
If you would like upgraded lab work and a personalized review of your Omega-3 status and overall health markers, send us a message or comment “LABS” and we’ll reach out with more information.