Carnitine Level Testing
Below is a plain-language overview of the carnitine level testing. Carnitine level testing measures the amount of carnitine in your blood. Carnitine is a substance your body uses to turn fat into energy. This test is ordered when a doctor suspects a carnitine deficiency or a disorder that affects how your body uses fatty acids.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $118
- Referral
- Not required
Carnitine level testing measures the amount of carnitine in your blood. Carnitine is a substance your body uses to turn fat into energy. This test is ordered when a doctor suspects a carnitine deficiency or a disorder that affects how your body uses fatty acids.
What it measures
- Total carnitine — The combined amount of all forms of carnitine in your blood.
- Free carnitine — The form that is readily available for your body to use.
- Acylcarnitine — Carnitine that is attached to fatty acids, helping them move into cells.
- Carnitine ratio — A calculated comparison of free carnitine to acylcarnitine, which can help identify certain conditions.
Who it is for
This test is usually ordered by a doctor, often a specialist such as a metabolic geneticist or neurologist, when a patient has symptoms like muscle weakness, low blood sugar, or unexplained fatigue.
Preparation
You may need to fast (not eat or drink anything except water) for several hours before the test. Your doctor will give you specific instructions; otherwise, no special preparation is needed.
Results and what they mean
Results are reported as numbers for each form of carnitine, often with a reference range. Your doctor will interpret these numbers along with your symptoms and other tests. This information is not medical advice; only a qualified healthcare professional can diagnose or treat any condition.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the carnitine level testing is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for this test?
Sometimes. Your doctor will tell you if you need to fast. If not, you can eat normally.
What do abnormal results mean?
Abnormal levels may suggest a carnitine deficiency or a metabolic disorder. Your doctor will explain what your specific results mean for you.
Is this test painful?
It is a standard blood draw, which may cause a brief pinch or sting. Most people tolerate it well.
How long until I get results?
Results are typically available in 1 to 3 business days, but this can vary by lab.