Carnitine in cerebrospinal fluid (Carnitine CSF)
This test measures the amount of carnitine, a fat-metabolizing substance, in your cerebrospinal fluid (the fluid surrounding the brain and spinal cord). It may be used to diagnose or monitor conditions affecting how your body uses fats for energy.
["Carnitine in CSF helps assess metabolic disorders linked to fat metabolism in the central nervous system."]
Key facts at a glance
- LOINC
- 55853-6
- Short code
- Dicarboxydodecanoylcarn CSF-sCnc
- Synonyms
- Dicarboxydodecanoylcarn CSF-sCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like weakness, fatigue, or neurological issues that could be linked to carnitine deficiency or metabolic disorders. It may also be part of a broader evaluation for inherited or acquired conditions affecting fat metabolism or energy production in the brain and spinal cord.
What to Expect Before the Test
No special preparation is typically needed. You may be asked to fast for a few hours before the test, but this depends on your provider’s instructions. The procedure involves a simple lumbar puncture (spinal tap) where fluid is collected from your lower back.
What the Test Results Mean
Results are compared to a reference range for carnitine in CSF, which can vary by lab. Low levels may suggest metabolic disorders, genetic conditions, or other neurological issues affecting fat metabolism. High levels could indicate certain metabolic imbalances or exposure to specific substances.
Common Conditions Monitored
This test is often used to diagnose or monitor conditions like carnitine palmitoyltransferase (CPT) deficiencies, mitochondrial disorders, or other inherited metabolic diseases that impact energy production in the central nervous system.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Carnitine is essential for transporting fatty acids into cells for energy production. In the CSF, low levels may indicate impaired fat metabolism in the brain or spinal cord, which can cause neurological symptoms. Early detection can guide treatment, such as dietary adjustments or supplements, to support metabolic health.
Short name
Carnitine Level (CSF)
Frequently asked questions
What causes low carnitine levels in CSF?
How is this test different from carnitine blood tests?
Can diet affect the results of this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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