Omega-3 Index Test: What It Is and What It Costs

The short answer: the Omega-3 Index is the percentage of your red blood cell fatty acids that are EPA and DHA. It is measured on a finger-prick dried blood spot, and OmegaQuant, the main seller, charges $54.95 for the Basic test, $79.95 for Plus and $99.95 for Complete (prices read 29 Sept 2026). Higher blood omega-3 goes with lower mortality in cohort studies, but that has not been shown to be a target you can buy your way to: 1 g a day of marine omega-3 did not significantly reduce major cardiovascular events in the VITAL trial. The test tells you your level; it does not tell you what to take. Talk to your doctor before changing supplements.

The three test tiers

All three include a collection kit and prepaid return postage, per OmegaQuant’s price page. OmegaQuant describes its lab as CLIA-regulated and says the test is not intended to diagnose or treat disease. Other retailers resell the same kits at their own prices; we did not compare them.

What the evidence shows

• Association with mortality. A pooled analysis of 17 prospective cohorts (15,720 deaths among 42,466 people, median 16 years) found all-cause mortality 15 to 18% lower in the highest versus lowest quintile of circulating EPA, DPA and DHA, with no link for plant-based ALA. Its declared conflicts include one author’s stock in OmegaQuant Analytics, the laboratory that sells this test. Observational: it cannot show that raising the level lowers risk.
• Trials of supplements. VITAL (25,871 adults, dose used in VITAL: 1 g/day of marine omega-3) did not significantly reduce major cardiovascular events. See our omega-3 page for VITAL, REDUCE-IT and STRENGTH side by side, and for the atrial fibrillation signal.
• How supplements move the index. In a modelling study of 1,422 people from 14 trials, the index rose from 4.9% to 8.1% on an average of 1,983 mg/day of EPA plus DHA over about 14 weeks. Response depended on dose, starting level and form: triglyceride-form supplements raised it about 1 percentage point more than ethyl-ester products gram for gram, and 850 mg/day of ethyl ester was modelled to take a 4.9% baseline to about 6.5%.

Test cost versus supplement cost

From our cost per study dose table: at the 840 mg EPA plus DHA a day used in VITAL, Thorne Super EPA came to $18.13 a month and Momentous Omega-3 to $20.99 (brand pages, 28 to 29 Sept 2026, before tax). So a $54.95 Basic test costs about three months of Thorne or 2.6 months of Momentous. If you eat oily fish regularly, or your doctor is already managing your triglycerides, the test may tell you little you can act on. For diet and exercise choices with firmer outcome evidence, see the longevity biomarkers guide and the graded supplement ladder.

Limits

Reference ranges come from the test’s developers. The 8 to 12% range is OmegaQuant’s; we did not find a guideline body that endorses it as a treatment target. Dried blood spot results depend on the lab method, so compare results from the same lab. OmegaQuant also claims most Americans have low levels; we could not verify that claim and do not repeat it as fact.

Method note

Researched from OmegaQuant’s pages and PubMed abstract records, checked 29 Sept 2026. Abstracts only. We did not take the test. Longevity Intel does not earn a commission from OmegaQuant. General information, not medical advice.