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Palmitoylcarnitine (Carnitine Palmitoyltransferase Activity or Long-Chain Fatty Acid Metabolism Profile)

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

This test measures how your body processes long-chain fatty acids, which are important for energy production and cell function. It may help assess metabolic health, especially in conditions affecting fat metabolism.

Quick summary

["This test helps evaluate fatty acid metabolism, useful for diagnosing or monitoring disorders like carnitine deficiency or mitochondrial disorders."]

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

Key facts at a glance

LOINC
88015-3
Short code
Palmitoylcarn/C2 DBS-sRto
Synonyms
Palmitoylcarn/C2 DBS-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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of metabolic issues, such as muscle weakness, fatigue, or unexplained weight changes. It can also be part of a broader evaluation for genetic or inherited metabolic disorders.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw. Bring any medications you’re taking, as they could affect results.

How the Test Is Performed

A healthcare professional will collect a blood sample from a vein in your arm. The sample is sent to a lab for analysis of palmitoylcarnitine levels and related metabolic activity.

Possible Results and Interpretation

Results may show abnormal levels of palmitoylcarnitine or related metabolites, which could indicate impaired fat metabolism. Your provider will discuss findings in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Long-chain fatty acid metabolism profile (serum)

Frequently asked questions

What does elevated or low levels of palmitoylcarnitine mean?
Elevated levels may suggest fatty acid oxidation disorders or mitochondrial dysfunction, while low levels could indicate carnitine deficiency or other metabolic imbalances. These findings often guide further testing or treatment plans.
How long will I need to wait for results?
Results typically take 1–3 business days, depending on lab processing. Your provider will contact you once they’re ready to discuss them.
Can I eat or drink anything before this test?
Most tests don’t require fasting, but confirm with your provider if you have specific dietary restrictions or conditions that might 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