Platform
Company
Immunology & Autoimmune
Review status
Currently under review
Pending specialist review and validation.
C8:1 Octenoyl, also called octenoylcarnitine, is one of the acylcarnitines that form when your body moves fatty acids into mitochondria to be broken down for energy. This test measures the amount of octenoylcarnitine in your blood using tandem mass spectrometry as part of an acylcarnitine profile.
Clinicians use this marker to assess how well fat is used for energy, especially in newborns and infants or in people being evaluated for inherited or acquired problems with fatty acid oxidation. It is interpreted together with other acylcarnitines and your clinical situation.
Results can help identify disorders that impair the body’s ability to convert fats into energy. Abnormal values may appear in inherited conditions of fatty acid oxidation, such as multiple acyl CoA dehydrogenase deficiency, and in nutritional states that affect vitamin cofactors like riboflavin. Changes can also occur during illness, poor intake, or metabolic stress.
Your care team may order this test when there are symptoms like low energy, vomiting, hypoglycemia, poor feeding in infancy, muscle pain, or unexplained illness. It can guide urgent care decisions, support genetic testing, and help monitor response to treatments tailored to specific metabolic conditions.
Your result is most meaningful when viewed with the full acylcarnitine profile, your symptoms, diet, and the timing of the blood draw. Mild, isolated changes may be temporary during fasting or intercurrent illness and often normalize with recovery and regular feeding. A persistent or more pronounced change, especially alongside a characteristic pattern in other acylcarnitines, may suggest a fatty acid oxidation disorder that warrants further evaluation.
If your result falls outside the expected range, your clinician may repeat testing when you are well, review your diet and medications, and consider additional studies such as urine organic acids, plasma carnitine measurements, or genetic testing. Do not adjust supplements or diet on your own; targeted therapies like riboflavin or carnitine are used only when appropriate and under medical guidance.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Recent fasting, poor intake, fever, or acute infection can temporarily alter acylcarnitine levels, including octenoylcarnitine. When possible, samples are collected when you are well and eating normally.
Riboflavin, carnitine, and certain drugs such as valproate can affect fatty acid oxidation and acylcarnitine profiles. Always share a complete list of prescriptions and supplements with your care team.
High fat or ketogenic diets shift how your body uses fats and can raise medium chain acylcarnitines. Sudden changes in diet or prolonged exercise may also influence results.
Newborns and premature infants have different baseline acylcarnitine patterns compared with older children and adults. Laboratories use age-appropriate reference intervals.
Whether testing is performed on plasma or a dried blood spot, and how quickly the sample is processed, can subtly influence measurements. Consistent collection and handling improve comparability.
References