: Octanoylcarnitine (C8) in Serum or Plasma

: What Is Octanoylcarnitine?

: Octanoylcarnitine, sometimes called C8 acylcarnitine, is a compound formed when a medium-chain fatty acid (octanoic acid) binds to carnitine. Carnitine helps transport fatty acids into mitochondria, the energy-producing parts of cells, so this measurement reflects part of the body's fat-processing machinery.

: Why the Test Is Ordered

: The test is usually part of a broader acylcarnitine profile, often ordered during newborn screening or when a clinician suspects a fatty acid oxidation disorder. It can also help monitor patients known to have certain metabolic conditions. Results are interpreted together with other acylcarnitines and clinical findings.

: How the Sample Is Collected

: A blood sample is drawn from a vein into a collection tube, and serum or plasma is separated for analysis. The specimen is typically analyzed by a mass-spectrometry-based method. No special preparation is usually required unless your care team gives specific instructions.

: Understanding the Results

: A single octanoylcarnitine value is not interpreted on its own; reference ranges vary by laboratory, age, and method. Because the abbreviation for the analytical method in this slug is not clearly specified, this description stays general. Your clinician will compare your result with the laboratory's range and with other test findings.