: Octenoylcarnitine, Serum or Plasma, Substance Concentration

: What Is Octenoylcarnitine?

: Octenoylcarnitine is a compound formed when carnitine binds to an eight-carbon fatty acid called octanoic acid. Carnitine acts like a shuttle that helps fatty acids enter the energy-producing centers of cells, and acylcarnitines are the forms in which these fatty acids are carried. Measuring octenoylcarnitine gives information about how well this transport and breakdown process is working.

: How the Test Is Used

: This measurement is usually not ordered alone. It is most often included in an acylcarnitine profile or a broader metabolic screen, particularly when a person has symptoms that suggest a fatty acid oxidation disorder or when newborn screening is being performed. Results are interpreted alongside other acylcarnitines and clinical information.

: What the Results Mean

: A result outside the expected range may point to a problem in fatty acid metabolism, but it is not a diagnosis on its own. Levels can be influenced by diet, fasting, sample handling, and the specific laboratory method used. Your care team will consider the result together with other tests and your symptoms.

: Preparing for the Test

: Follow any instructions from your healthcare provider about fasting or timing of the sample. Tell your provider about all medications and supplements you take, because some can affect metabolism and test results. Sample collection is a routine blood draw.