Serum or plasma concentration of free fatty acids (via enzymatic method)

What Are Free Fatty Acids?

Free fatty acids are a type of fat that circulate in your bloodstream. They are released from fat cells when your body needs energy, especially during fasting or exercise. Your liver also produces them. These fats are essential for energy but can become problematic if levels are too high or too low.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like fatigue, muscle weakness, or if you have conditions such as diabetes, thyroid disorders, or metabolic syndrome. It may also be checked before certain treatments, like chemotherapy, or to monitor long-term health in people with chronic illnesses.

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 instructed. Bring any medications you’re taking, as some can affect results. Wear comfortable clothing and plan to stay near the testing site for a few minutes.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but it usually doesn’t cause significant discomfort. The blood sample is then sent to a lab for analysis.