Serum or plasma concentration of free fatty acids (FFAs) measured by a chemiluminescent immunoassay (CLIA)
This test measures the level of free fatty acids, which are a type of fat found in your blood. They play a key role in energy production and cell function.
["Free fatty acids help your body use energy efficiently and support normal metabolism."]
Key facts at a glance
- LOINC
- 33100-9
- Short code
- GA from FL.lessoway98
- Synonyms
- GA from FL.lessoway98
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- us-estimated-from-fl-lessoway
- 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 recommend this test if you have symptoms or conditions linked to abnormal fat metabolism, such as high triglycerides, diabetes, or thyroid disorders. It can also help monitor certain treatments or underlying health conditions that affect fat levels in your blood.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves a blood draw, but this depends on your specific order. Always follow your provider’s instructions.
How the Test Is Performed
A small sample of blood is drawn from a vein in your arm using a needle. The blood is then processed to separate serum or plasma for testing. The lab uses a sensitive immunoassay method to detect free fatty acids.
What the Results Mean
Results are reported as a concentration value (e.g., in mmol/L or mg/dL), but exact reference ranges vary by lab. High or low levels may signal metabolic issues or other health concerns that need further evaluation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated free fatty acids can be associated with metabolic syndrome, insulin resistance, or conditions like pancreatitis. Low levels may indicate malabsorption, liver disease, or certain medications. Your provider will interpret results in the context of your overall health and symptoms.
Short name
Free Fatty Acids (Serum/Plasma)
Frequently asked questions
What causes free fatty acids to be tested?
Do I need to fast before this test?
How long will it take to get my 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