Guide to Omega‑3 Total

WRITTEN BY

The Levels Team

Updated: 05/22/2025|12 min read

Summary

Total omega-3 measures all forms of omega-3 fatty acids in your blood, including eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), docosapentaenoic acid (DPA), and alpha-linolenic acid (ALA). 

Why It Matters

Omega-3s are essential fatty acids that your body needs but can't make on its own. They serve as building blocks for cell membranes and play vital roles in brain function, heart health, and inflammation control. 

Each type of omega-3 has specific roles: EPA primarily fights inflammation and supports mood. DHA is crucial for brain and eye function. And DPA acts as a storage form that can convert to either EPA or DHA when needed. ALA, found in plant foods, is a precursor that your body can convert into these more active forms. 

Total omega-3 measurement shows your combined levels of all these forms. This is important because your body can convert certain omega-3s based on its needs. For example, if you're fighting inflammation, your body might use more EPA; if you're healing nerve tissue, it might need more DHA. Having adequate total omega-3s ensures your body has enough raw material for all these functions.

Omega-3 deficiency can develop slowly and affect many body systems. Since omega-3s compete with omega-6 fatty acids for use in your body, having enough total omega-3s helps maintain a healthy balance between inflammatory and anti-inflammatory processes.

Associated Symptoms

Omega-3 levels themselves are laboratory findings rather than medical conditions. However, suboptimal omega-3 status may be associated with certain health conditions, each with its own symptoms.

Conditions potentially associated with low omega-3 status:

• Inflammatory disorders: Joint pain and stiffness, chronic inflammation
• Cardiovascular conditions: May contribute to irregular heartbeat, blood pressure variations
• Mood disorders: Depression, anxiety, irritability (omega-3s play a role in brain function)
• Cognitive changes: Poor concentration, memory issues (DHA is a major structural component of the brain)
• Skin conditions: Dry skin, eczema and psoriasis flare-ups, poor wound healing
• Eye health issues: Dry eyes (DHA is concentrated in the retina)
• Pregnancy: The need for omega-3's increases during pregnancy because omega-3's are important for the development of the baby's eyes, brain, and nervous system. The need increases by the baby, which can decrease levels in the mom.

Conditions potentially associated with excessively high omega-3 levels (rare, usually from excessive supplementation):

• Bleeding disorders: Increased bleeding time, easier bruising may be due to omega-3's mild anticoagulant effects
• Digestive disturbances: Diarrhea, constipation, nausea, fishy aftertaste (typically from supplements)
• Medication interactions: Enhanced effects of blood thinners or antiplatelet medications
• Immune Dysfunction: Can affect the body's ability to fight microbial pathogens

It's important to note that these relationships are complex and often bidirectional. Many factors beyond omega-3 levels influence these health conditions, and symptoms can be caused by numerous other factors. Your doctor will consider omega-3 status as one piece of your overall health picture.

Clinical Ranges

Lab Reference Range: > 5.4 % by wt

Lifestyle Factors That Can Impact It

Activities that increase total omega-3 levels include:

• Regular consumption of omega-3-rich foods:
• Fatty fish (highest sources, providing EPA and DHA):
• Salmon (wild-caught has 2-3 times more omega-3s than farmed)
• Mackerel (especially Atlantic and Pacific mackerel)
• Sardines
• Herring
• Anchovies
• Trout
• Plant sources (providing ALA, which converts to EPA and DHA at low rates):
• Flaxseeds and flaxseed oil
• Chia seeds
• Walnuts
• Hemp seeds
• Algal oil (a vegan source that directly provides DHA)
• Balanced omega-6 to omega-3 ratio: Reducing intake of processed foods high in vegetable oils helps optimize this balance

Activities that decrease total omega-3 levels include:

• A high omega-6 diet: Ultra-processed foods, vegetable oils (corn, soybean, safflower), and fried foods can compete with omega-3 absorption and utilization
• Chronic stress: Increases omega-3 depletion through oxidative stress and inflammatory processes
• Poor sleep: Raises inflammation and increases omega-3 usage
• Excessive alcohol use: Impairs omega-3 absorption and utilization

Other Factors That Can Impact It

Medical Conditions

• Inflammatory diseases: decrease levels by using up omega-3s faster
• Diabetes: lowers levels by altering fat metabolism
• Liver disease: reduces levels by increasing utilization, and impairing synthesis and fat processing
• Digestive disorders: decrease absorption of omega-3s
• Thyroid problems: affect fat metabolism
• Autoimmune conditions: deplete omega-3s through inflammation

Medications

• Blood thinners: don't change levels but compound omega-3's anticoagulant effects
• Statins: may decrease levels by affecting fat metabolism
• Birth control: may lower levels by increasing inflammation and affecting fat processing
• NSAIDs: might help preserve omega-3 levels by lowering inflammation

Environmental Factors

• Water quality: Toxins can interfere with the production of omega-3 in the food chain.
• Air pollution: Increases omega-3 usage through oxidative stress.

Testing Accuracy and Stability

Total omega-3 testing provides a more stable measurement than individual omega-3 tests. However, several factors can still affect results. Understanding these factors helps ensure accurate assessment.

Factors That Can Affect Your Test Results

• Recent meals with fatty fish can increase levels for several days.
• Fish oil supplements can affect levels for up to two weeks.
• Inflammation from a recent illness temporarily lowers levels.

How It Relates to Other Markers

Other tests can provide insights about health status when they're viewed alongside total omega-3 results. These tests may include:

• Total omega-6: Higher levels compete with omega-3s and lead to lower total omega-3.
• Omega-3 index: This index measures the percent of DHA and EPA in the membranes of red blood cells, and helps validate results.
• Individual omega-3s: Low EPA, DHA, or DPA may suggest reasons for low total omega-3.
• Inflammatory markers: High inflammation can deplete  omega-3s, lowering total levels.
• Triglycerides: High levels can indicate problems that may be lowering omega-3 absorption.
• Vitamin D: Low levels can reduce fatty acid metabolism.
• Insulin: High levels can increase inflammation and omega-3 utilization.
• Liver function tests: Poor liver function can reduce omega-3 synthesis and fat.

Follow-up Considerations

If your total omega-3 levels are low, your provider may work with you on a plan to address any levels that are out of range. Their recommendations may include the following. You should always speak to your doctor if you have medical questions or before making medical decisions. 

When Re-Testing May be Appropriate

• Normal levels: Every 6--12 months
• Low levels: Every 3 months until normalized
• During supplementation: Every 3--4 months
• Inflammatory conditions: Every 3 months
• Pregnancy: With routine labs

Additional Testing Your Doctor May Consider

• Omega-6/omega-3 ratio
• Inflammatory markers
• Cardiovascular risk markers
• Oxidative stress markers

When Additional Care May be Warranted

• Persistently low levels despite supplementation
• High inflammation with low omega-3s
• Cardiovascular symptoms
• Poor conversion patterns
• Multiple fatty acid imbalances

Further Reading

Why omega 3s are crucial to strong metabolic health

Bibliography