Skip to content

Serum/Plasma Free Fatty Acids (Concentration) with Enzymatic Method

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

This test measures the level of free fatty acids in your blood, which are important fats your body uses for energy. Free fatty acids play a role in metabolism and can be influenced by diet, exercise, and certain medical conditions.

Quick summary

["Free fatty acids help your body produce energy, but high or low levels may signal health concerns."]

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

Key facts at a glance

LOINC
111578-1
Short code
Hepat GFREcep AG in Tiss Tiss Doc IA
Synonyms
Hepat GFREcep AG in Tiss Tiss Doc IA
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
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

What Does This Test Measure?

Free fatty acids are a type of fat that circulate in your blood. Your body breaks down fats into these fatty acids to use as fuel, especially during exercise or fasting. This test specifically measures the concentration of free fatty acids in your serum or plasma, which can be influenced by factors like diet, physical activity, and certain medications.

Why Might You Need This Test?

Doctors may order this test to evaluate metabolic health, diagnose conditions like diabetes or metabolic syndrome, assess nutritional status, or monitor treatment responses in patients with disorders affecting fat metabolism.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is then processed to separate serum or plasma, which is analyzed using an enzymatic method to measure free fatty acid levels.

What Do Results Mean?

Results provide a quantitative measure of free fatty acids in your bloodstream. While reference ranges can vary by lab, elevated levels may indicate conditions like uncontrolled diabetes, fasting, or certain hormonal imbalances. Lower levels might suggest malnutrition, liver disease, or other metabolic issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Free Fatty Acids in Health and Disease

Short name

Free Fatty Acids (FFA) Serum/Plasma

Frequently asked questions

What are the normal ranges for this test?
Normal ranges can differ between labs and may depend on factors like age, sex, and overall health. Your healthcare provider will interpret your results in the context of your medical history and symptoms. If your results are outside typical ranges, further evaluation may be needed to understand the cause.
Can diet or exercise affect my free fatty acid levels?
Yes, diet and exercise can influence free fatty acid levels. Eating a high-fat diet or fasting can increase these levels, while physical activity may temporarily lower them. Your doctor may recommend lifestyle adjustments or dietary changes if your results suggest metabolic concerns.
Are there any side effects or risks associated with this blood test?
Blood tests like this are generally safe. The most common side effect is mild bruising, swelling, or discomfort at the injection site. Rarely, there may be a slight reaction to the needle. If you experience excessive pain or bleeding, contact your healthcare provider immediately.
  1. 1
  2. 2
  3. 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.

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