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Malonylcarnitine (Carnitine Substance Concentration)

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

This test measures the amount of malonylcarnitine in your blood, a compound formed during the breakdown of fatty acids.

Quick summary

["Malonylcarnitine helps assess how well your body processes fats and can signal potential metabolic issues."]

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

Key facts at a glance

LOINC
54318-1
Short code
Me-malonylcarn Amn-sCnc
Synonyms
Me-malonylcarn Amn-sCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like fatigue, muscle weakness, or unexplained weight changes, especially if you have a history of metabolic disorders or genetic conditions affecting fat metabolism.

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 your medical records if you have a history of metabolic conditions.

How the Test Works

A small blood sample is taken from a vein in your arm. The sample is sent to a lab where it is analyzed using a specialized technique to measure malonylcarnitine levels.

What the Results Mean

Results are compared to a general reference range for healthy adults. Elevated levels may indicate problems with fat metabolism, while lower levels could suggest other metabolic or genetic conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Malonylcarnitine

Frequently asked questions

Elevated malonylcarnitine levels may signal conditions like mitochondrial disorders, fatty acid oxidation defects, or certain inherited metabolic diseases. It’s often used alongside other tests to guide diagnosis and treatment planning.
This test alone won’t diagnose a specific condition. Your healthcare provider will review results alongside your symptoms, medical history, and other tests.
What causes malonylcarnitine levels to change?
Changes in malonylcarnitine levels can occur due to genetic factors, certain medications, fasting, or underlying metabolic disorders. If you’re concerned, discuss any recent changes in diet, medications, or symptoms with your provider.
Can diet affect malonylcarnitine test results?
Yes, fasting before the test is important because diet (especially high-fat foods) can influence fatty acid metabolism and malonylcarnitine levels. Follow your provider’s instructions for preparation.
  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