Serum or plasma concentration of free fatty acids (FFAs) measured by immunoassay
This test measures the levels of free fatty acids, which are important fatty molecules released from fat cells into the bloodstream. They play a key role in energy production and metabolism.
["Free fatty acids help your body use energy efficiently and support normal metabolic function."]
Key facts at a glance
- LOINC
- 3235-9
- Short code
- Fact XII Ag Act/Nor PPP IA
- Synonyms
- Fact XII Ag Act/Nor PPP IA
- Category
- chemistry
- Sample
- plasma
- Container
- Lavender-top (EDTA) or Green-top (Heparin)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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 healthcare provider may order this test to evaluate metabolic health, assess conditions affecting fat metabolism, or monitor treatment responses in conditions like diabetes, thyroid disorders, or liver disease.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves a blood draw. Avoid excessive alcohol or strenuous activity 24 hours prior.
How the Test Works
A small blood sample is taken from a vein in your arm. The sample is then analyzed using an immunoassay method to measure the concentration of free fatty acids in your serum or plasma.
What the Results Mean
Results help identify imbalances in fat metabolism, which may indicate conditions like hyperlipidemia, malnutrition, or hormonal imbalances. Your provider will interpret results in the context of your overall health.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated free fatty acid levels may signal metabolic disorders, such as uncontrolled diabetes or thyroid dysfunction, while low levels could suggest malnutrition, liver disease, or certain endocrine conditions. Regular monitoring is important for patients with metabolic disorders or those undergoing treatment for fat metabolism issues.
Short name
Free Fatty Acids (serum/plasma)
Frequently asked questions
What causes free fatty acid levels to change?
How often should I get this test?
Can lifestyle changes affect my test results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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