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Stearoyl-CoA Carnitine (Carnitine Ester) in Serum/Plasma

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

This test measures the concentration of stearoyl-carnitine, a fatty acid bound to carnitine in your blood, which helps assess how well your body is processing fats.

Quick summary

["Your doctor may check this test to evaluate fatty acid metabolism or detect potential metabolic disorders."]

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

Key facts at a glance

LOINC
54334-8
Short code
Stearoylcarn CSF-sCnc
Synonyms
Stearoylcarn 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 muscle weakness, fatigue, or unexplained metabolic issues. It could also be part of a broader evaluation for conditions affecting fat metabolism, such as medium-chain acyl-CoA dehydrogenase (MCAD) deficiency or other carnitine-related disorders.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it. Wear comfortable clothing and plan to rest for a short time afterward.

How the Test Works

A small sample of your blood (serum or plasma) is collected via a vein in your arm. The sample is then analyzed using a specialized laboratory method to measure the concentration of stearoyl-carnitine, often through high-performance liquid chromatography (HPLC) or a similar technique.

What the Results Mean

Results are not typically provided as a single reference range since carnitine esters vary widely by condition. Elevated levels may suggest impaired fat metabolism, while very low levels could indicate deficiencies or genetic disorders. Your doctor will interpret results 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

Stearoyl-Carnitine Level

Frequently asked questions

What could cause abnormal results?
Abnormally high stearoyl-carnitine levels may be linked to inherited metabolic disorders, such as medium-chain acyl-CoA dehydrogenase (MCAD) deficiency, or conditions affecting fat breakdown. Very low levels could indicate carnitine deficiency, liver disease, or other metabolic issues. Always discuss results with your healthcare provider.
How often should this test be repeated?
If your doctor orders this test for monitoring a known metabolic condition, they may recommend follow-up tests at regular intervals. If this is a one-time screening, repeat testing depends on your symptoms and clinical needs. Follow your provider’s guidance.
Can diet affect this test?
Yes, diet can influence carnitine and fatty acid metabolism. Avoiding high-fat meals for 8–12 hours before testing may help ensure more accurate results. If you have dietary restrictions or concerns, discuss them with your doctor before the test.
  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