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Free Carnitine in Cerebrospinal Fluid

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

This test measures the amount of free carnitine, a compound that helps transport fatty acids into cells for energy production, in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord).

Quick summary

["Free carnitine in CSF may help assess metabolic or neurological conditions affecting carnitine levels."]

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

Key facts at a glance

LOINC
53072-5
Short code
C0CSF
Synonyms
Carnitine Free CSF-sCnc
Category
chemistry
Sample
csf
Container
Sterile, screw-capped, polypropylene CSF collection tube; free of preservatives. Tube #2 or #4 of sequential collection is preferred to minimize blood contamination.
Units
N/A
Ref low
1.5
Ref high
5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
CPT
82017
SNOMED
395081003
Specimen volume
0.5-1.0 mL of cerebrospinal fluid
Stability
Room temperature: 2 hours; Refrigerated (2-8°C): 24 hours; Frozen (-20°C or lower): up to 3 months. Ship frozen on dry ice if referral testing is required.
Hemolysis max
200
TAT
48–168 hours
Order
routine

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like weakness, fatigue, or neurological issues that could be linked to metabolic disorders, such as mitochondrial diseases or inherited carnitine deficiencies. It may also be used in research or specialized clinical settings to monitor carnitine status in CSF.

What Does This Test Involve?

A small sample of cerebrospinal fluid is collected through a procedure called lumbar puncture (spinal tap). The fluid is then analyzed in a lab to measure free carnitine levels.

What Does a Result Mean?

Results may be compared to expected ranges for healthy individuals, though specific reference ranges can vary by lab. Abnormal levels might suggest underlying metabolic or neurological conditions requiring further evaluation.

Common Conditions Monitored or Diagnosed With This Test

Free carnitine in CSF is less commonly used for routine diagnosis but may be part of investigations for rare genetic disorders, mitochondrial diseases, or conditions affecting carnitine metabolism in the central nervous system.

Reference range

Reference values for free carnitine (C0) in cerebrospinal fluid are laboratory-specific; typical reported ranges are approximately 1.5-5.0 µmol/L in healthy adults. Consult the performing laboratory's reference range for clinical interpretation.N/A

Specimen: csf

No special patient preparation required. CSF collection is performed by lumbar puncture under sterile conditions by qualified personnel. Patient should remain calm during the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Free carnitine in CSF is primarily used in specialized clinical or research contexts to assess carnitine status in the central nervous system. Abnormalities may indicate metabolic disorders, neurological complications, or conditions affecting carnitine transport and function in the brain or spinal cord.

Short name

Free Carnitine (CSF)

Frequently asked questions

What does a low or high free carnitine level in CSF mean?
Low levels might suggest a deficiency in carnitine transport or metabolism within the central nervous system, which could be linked to genetic disorders or mitochondrial dysfunction. High levels could indicate conditions affecting carnitine breakdown or specific metabolic pathways, though interpretation requires clinical correlation.
How is this test different from free carnitine tests in blood?
This test specifically measures free carnitine in cerebrospinal fluid, whereas blood tests measure carnitine levels in plasma or serum. CSF carnitine can reflect metabolic or neurological conditions affecting the central nervous system differently than blood levels.
Is this test painful?
The procedure for collecting CSF involves inserting a needle into your lower back, which can cause mild discomfort or temporary soreness. Most people describe it as similar to a menstrual cramp or a sharp pinch. Pain management options, such as local anesthesia, may be used to minimize discomfort.
  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