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Serum Free Fatty Acids (as measured by a specific enzymatic method)

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

This test measures the levels of free fatty acids in your blood serum, which are important for energy production and other metabolic processes.

Quick summary

["Free fatty acids help your body use energy efficiently and support healthy cell function."]

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

Key facts at a glance

LOINC
47747-1
Short code
Serine SFr DBS
Synonyms
Serine SFr DBS
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 check free fatty acids in your blood if they suspect conditions like diabetes, metabolic disorders, or certain types of heart disease. It can also be part of routine monitoring for people with known fatty acid metabolism issues.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if your provider specifies it. Wear a comfortable shirt for easy access to your arm.

What Happens During the Test

A healthcare professional will insert a small needle into a vein in your arm to draw a blood sample. You may feel a brief pinch, but it should only take a few minutes. The blood is then sent to a lab for analysis.

What the Results Mean

Results are typically reported as a concentration value, but your provider will interpret them in the context of your overall health and medical history. Elevated or low levels may signal underlying conditions that need further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free Fatty Acids (Serum)

Frequently asked questions

What causes free fatty acids to be tested?
Free fatty acids may be tested if you have symptoms like fatigue, muscle weakness, or unexplained weight changes. It’s also used in monitoring conditions like diabetes, thyroid disorders, or heart disease.
How do I prepare for this test?
Follow your provider’s instructions, which may include fasting or avoiding certain medications. Generally, no special preparation is needed unless directed otherwise.
What are the typical reference ranges for free fatty acids?
Reference ranges vary by lab and individual factors. Your provider will discuss the results with you and compare them to your specific health needs.
  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