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Octanoylcarnitine in Serum/Plasma (Carnitine Acyltransferase Assay)

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

This test measures the amount of octanoylcarnitine, a type of fatty acid linked to carnitine, in your blood. It helps assess how well your body is processing fats and certain metabolic functions.

Quick summary

["This test may help diagnose or monitor conditions affecting fat metabolism or mitochondrial function."]

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

Key facts at a glance

LOINC
59200-6
Short code
Octanoylcarn/C2 SerPl-sRto
Synonyms
Octanoylcarn/C2 SerPl-sRto
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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?

Octanoylcarnitine is a compound formed when fatty acids are transported into cells for energy. Elevated levels may indicate issues with fatty acid metabolism, such as in mitochondrial disorders or certain genetic conditions.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like muscle weakness, fatigue, or unexplained metabolic problems. It’s also used in research or specialized metabolic evaluations.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then processed to measure octanoylcarnitine levels using specialized laboratory techniques.

What Are Possible Results?

Results are compared to reference ranges specific to your age, sex, and health status. Abnormal results may prompt further testing or evaluation of metabolic health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Elevated or low levels of octanoylcarnitine can signal underlying metabolic disorders, such as carnitine deficiency, mitochondrial diseases, or disorders of fatty acid oxidation. These conditions may affect energy production, muscle function, or overall health. Your doctor will interpret results in the context of your symptoms and medical history.

Short name

Octanoylcarnitine

Frequently asked questions

What does an abnormal result mean?
An abnormal result may suggest a metabolic issue that requires further evaluation, such as genetic testing or additional blood tests to identify the root cause.
How often should I get this test?
The frequency depends on your health condition. Your doctor will determine how often you need retesting based on your treatment plan and symptoms.
Is there anything I should do before the test?
No special preparation is needed unless instructed by your healthcare provider. Avoid fasting unless directed, as it may affect results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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