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Carnitine Palmitoyltransferase 1 Activity (CPT1 Activity)

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

This test measures the activity level of an enzyme called carnitine palmitoyltransferase 1 (CPT1), which plays a key role in breaking down fats for energy in your cells.

Quick summary

["CPT1 activity helps assess how well your body can use fats for energy, which may be important in conditions affecting metabolism or muscle function."]

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

Key facts at a glance

LOINC
54335-5
Short code
Stearoylcarn Amn-sCnc
Synonyms
Stearoylcarn 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 muscle weakness, fatigue, or metabolic issues that could be linked to fat metabolism problems. It might also be used in research or specialized diagnostic scenarios involving mitochondrial or fatty acid oxidation disorders.

What to Expect Before the Test

No special preparation is typically required, but you may be asked to fast for a few hours before the blood sample is taken. Your provider will give you specific instructions if needed.

How the Test Works

A small amount of blood is drawn from a vein in your arm. The blood sample is then analyzed in a lab to measure the activity of CPT1 enzyme, which converts fatty acids into energy.

What the Results Mean

Results are usually reported as a ratio or activity level compared to a standard. Abnormal results may suggest issues with fat metabolism, but interpretation depends on clinical context and other test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Carnitine Palmitoyltransferase 1 Enzyme Activity

Frequently asked questions

What causes abnormal CPT1 activity?
Abnormal CPT1 activity may be caused by genetic mutations affecting the enzyme, metabolic disorders, or conditions that impair fat metabolism. It could also be influenced by certain medications or underlying health conditions.
How long does it take to get results?
Test results are typically available within 1 to 3 business days, depending on the lab and your healthcare provider’s workflow. Follow-up with your provider to discuss results and next steps.
Can lifestyle changes affect this test?
While diet and exercise can influence overall metabolic health, specific dietary restrictions are rarely required for this test. However, fasting may be necessary before collection, so follow your provider’s instructions.
  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