Omega-3 Index blood test in Chiswick

What the test measures

The Omega-3 Index measures EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) as a percentage of all the fatty acids in the membranes of your red blood cells. Because red cells live for around three to four months, the index reflects your omega-3 intake over recent months rather than what you ate yesterday.

EPA and DHA come mainly from oily fish such as salmon, mackerel, sardines and herring, and from fish or algae oil supplements. The body converts only small amounts from plant sources such as flaxseed and walnuts. The NHS advises at least two portions of fish a week, one of them oily, and the index gives a practical way to see how your own intake translates into what is in your cells.

The price includes the sample taken at our Chiswick clinic, analysis at the Randox accredited laboratory, a practitioner review of your result, and a GP feedback report on request.

Who it is for

• You rarely eat oily fish.
• You follow a vegetarian or vegan diet and want to know whether you need an algae-based supplement.
• You take an omega-3 supplement and would like to see whether it is raising your level.
• You are interested in heart health and diet and want a measurable starting point.
• You are pregnant or planning a pregnancy and want to talk through your omega-3 intake with a practitioner.

Understanding your result

Your report gives your index as a percentage alongside the target range used by the laboratory. A lower index usually reflects low intake of EPA and DHA, and a higher index reflects regular oily fish or supplement use. Research has linked higher omega-3 levels with markers of heart health, but the index is not a diagnosis and does not predict any individual outcome.

Your practitioner will look at your result together with your diet and any medicines. If you take blood-thinning medicines or are considering high-dose supplements, it is best to speak to your GP or pharmacist before making changes.

Preparing for your test

You do not need to fast. Keep to your usual diet and any supplements you normally take, so the result reflects your typical pattern, and let us know what supplements you use and at what dose. If you are starting a new supplement, retesting after about three to four months gives the clearest picture of change.

If you would also like your fatty acid balance in more detail, the Omega-3 Index Complete adds a wider fatty acid breakdown. For a broader look at diet-related markers, see Nutritional and Digestive Health or every blood test and price in Chiswick.

Questions

How much is an Omega-3 Index test in Chiswick?

The Omega-3 Index costs £119. It includes the blood sample at our Chiswick clinic, analysis at the Randox accredited laboratory, a practitioner review of your result, and a GP feedback report on request.

Do I need to fast for an Omega-3 Index?

No. The index reflects the past few months of intake, so a single meal makes little difference.

How often should I retest?

If you change your diet or start a supplement, waiting around three to four months allows your red blood cells to renew and shows the effect more clearly.

Can vegans raise their Omega-3 Index?

Yes. Algae oil supplements provide EPA and DHA directly. Your practitioner can talk through your options.