---
title: "What does a low EPA mean?"
type: biomarker-interpretation
url: "https://www.test-well.com/biomarkers/epa/low"
biomarker: EPA
direction: low
reference_range:
  - "age 18+: 14.0 – 100 mcg/mL"
reviewed_at: 2026-09-08
review_status: reviewed
date_published: 2026-09-05
---

# What does a low EPA mean?

> Low EPA (eicosapentaenoic acid) in the blood means little recent intake of oily fish or EPA-containing supplements. EPA is the omega-3 with the strongest cardiovascular trial evidence (high-dose purified EPA lowered events in people with high triglycerides). It is read with DHA and the Omega-3 Index, which summarize membrane status better than either single fatty acid.


## What is the normal range for EPA?

- age 18+: 14.0 – 100 mcg/mL



## What are the common causes of low EPA?

1. Low intake of oily fish
2. No EPA/DHA supplements (plant ALA converts poorly)
3. High omega-6 intake

## What symptoms go with low EPA?

- None

## What do clinicians usually check next?

- Omega-3 Index for the three-month picture
- Dietary fish or EPA/DHA supplementation; retest in 4 months
- Triglycerides — if high with cardiovascular risk, prescription EPA is a clinician discussion

## How do you recheck EPA?

| Test or panel | Type | Price | Fasting | Results |
| --- | --- | --- | --- | --- |
| [Longevity & Anti-Aging Panel](https://www.test-well.com/tests/longevity-panel) | Panel (13 tests) | $239.99 | Yes | 3–7 business days |
| [Healthy Aging Panel](https://www.test-well.com/tests/healthy-aging-panel) | Panel (15 tests) | $299.99 | Yes | 3–5 business days |
| [Total Body Panel](https://www.test-well.com/tests/total-body-panel) | Panel (49 tests) | $499.99 | Yes | 5–10 business days |
| [Omega-3 Index](https://www.test-well.com/tests/omega-3-index) | Test | $69.99 | No | 7–10 business days |

Plus one $6 lab processing fee per order; physician authorization included.

## Common questions

### EPA or DHA — which matters more?

EPA has the stronger evidence for cardiovascular events; DHA is more important for brain and eye tissue. Most people are low in both and fish or combined supplements raise both.

## Related

- [EPA reference ranges](https://www.test-well.com/biomarkers/epa)
- [Apolipoprotein B reference range](https://www.test-well.com/biomarkers/apolipoprotein-b)
- [Lipoprotein(a) reference range](https://www.test-well.com/biomarkers/lipoprotein-a)
- [NT-proBNP reference range](https://www.test-well.com/biomarkers/nt-probnp)

## Sources

- [Quest Diagnostics](https://testdirectory.questdiagnostics.com/test/test-detail/91748/omega-3-and-6-fatty-acids)
- [NIH Office of Dietary Supplements — Omega-3 fatty acids fact sheet](https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-08. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/biomarkers/epa/low
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.