Lab test
Carnitine Level Testing - Deficiency Test
A carnitine blood test measures carnitine, a compound that carries fatty acids into the mitochondria so cells can turn them into energy, especially in muscle and heart.
- Typical price
- From $118
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
A carnitine blood test measures carnitine, a compound that carries fatty acids into the mitochondria so cells can turn them into energy, especially in muscle and heart. Low carnitine can occur with inherited metabolic disorders, certain medications, kidney disease, or poor nutrition, and may cause muscle weakness, fatigue, or heart problems. Testing helps evaluate suspected deficiency, investigate muscle and heart disorders, and monitor people receiving carnitine supplementation.
What this test measures
- Total Carnitine The combined amount of free and bound carnitine in the blood.
- Free Carnitine The unbound form available for fatty acid transport.
- Acylcarnitine Carnitine bound to fatty acids; measured to assess the acylcarnitine profile and metabolism.
Who this test may be right for
- People with unexplained muscle weakness or fatigue
- Individuals with cardiomyopathy or heart muscle disorders
- Patients with a suspected inherited metabolic disorder
- People taking medications that can deplete carnitine
- Individuals being monitored while receiving carnitine
Before your visit
- Fasting is often required; follow the instructions included with your order
- Report all medications, especially valproic acid and similar drugs
- Tell the phlebotomist about carnitine supplements
- Avoid strenuous exercise before collection if advised
Understanding your results
Low carnitine levels may point to a deficiency, which can be primary or secondary to another condition, and are interpreted with acylcarnitine findings and clinical history. Normal results do not exclude every metabolic disorder, and results may be affected by diet, medications, and timing. Discuss your carnitine result and what it suggests about your metabolism with a healthcare provider.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does carnitine do in the body?
Carnitine transports fatty acids into mitochondria so they can be used for energy. Low levels can affect muscles and the heart, which is why it may be tested.
What is the difference between free and total carnitine?
Free carnitine is the unbound, available form, while total carnitine includes both free carnitine and carnitine bound to fatty acids as acylcarnitine.
Do medications affect carnitine levels?
Yes. Some medications, such as valproic acid, can lower carnitine. Tell your provider what you take so results can be interpreted correctly.
Do I need to fast for a carnitine test?
Fasting is often requested because food affects fatty acid metabolism and carnitine measurements. Check your order instructions.
What does the Carnitine Level Testing - Deficiency Test measure?
This blood test is used to measure carnitine levels to evaluate for various muscle disorders. Carnitine deficiencies prevents the body from using certain fats.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Carnitine Level Testing - Deficiency Test results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
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