Skip to content

Total Omega-3 Fatty Acid Levels (Serum or Plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the total amount of omega-3 fatty acids in your blood, which are important for heart health, brain function, and reducing inflammation.

Quick summary

["Omega-3s support heart and brain health; low levels may increase inflammation risk."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
35970-3
Short code
XR tomo Extr
Synonyms
XR tomo Extr
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr-tomography
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have a history of heart disease, high triglycerides, or if you’re considering omega-3 supplements. It can also help assess whether your diet or supplements are providing adequate omega-3s.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken from a vein in your arm. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results are typically reported as a percentage of total fatty acids or absolute concentration. Lower than expected levels may indicate poor dietary intake or metabolic issues.

Common Causes of Low or High Results

Low levels may stem from poor diet, certain medications, or metabolic disorders. High levels could be due to excessive omega-3 intake from supplements or diet.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Omega-3 fatty acids play a role in reducing inflammation, supporting cardiovascular health, and potentially lowering the risk of chronic diseases. Monitoring levels helps tailor dietary or supplement recommendations to meet health goals.

Short name

Omega-3 Index

Frequently asked questions

What does a low omega-3 level mean for my health?
A low omega-3 level may suggest you could benefit from increasing omega-3-rich foods (like fatty fish, flaxseeds) or supplements, but results alone don’t diagnose conditions. Discuss findings with your doctor for personalized advice.
How often should I get this test?
There’s no standard frequency, but your doctor may recommend it annually if you have risk factors (e.g., heart disease) or if you’re using omega-3 supplements. Follow-up depends on your health status.
Can diet changes affect test results?
Yes, diet plays a key role. Eating more omega-3 foods (e.g., salmon, walnuts) or taking supplements may raise levels. Avoiding supplements for a few weeks before testing can help assess natural intake.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy