Carnitine, Free
Ordering Recommendation

Preferred testing is Carnitine, Free & Total (Includes Carnitine, Esterified) (0080068).

Tandem Mass Spectrometry
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Green (sodium or lithium heparin). Also acceptable: Plain red. 
Specimen Preparation
Separate serum or plasma from cells and freeze ASAP or within 2 hours of collection. Transfer 0.5 mL serum or plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.2 mL) Avoid hemolysis. 
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. 
Unacceptable Conditions
Room temperature specimens. Specimens that have been refrigerated for greater than 12 hours. 
After separation from cells: Ambient: Unacceptable; Refrigerated: 12 hours; Frozen: 1 month (avoid repeated freeze/thaw cycles) 
Reference Interval
Effective May 16, 2011
AgeFree Carnitine
1-31 days15-55 µmol/L
32 days-12 months29-61 µmol/L
13 months-6 years25-55 µmol/L
7 years-20 years22-63 µmol/L
21 years or older25-60 µmol/L

Interpretive Data

Statement B: Compliance Statement B: For laboratory developed tests not using a RUO kit, and for FDA approved, cleared or 510(k) exempt assays with alterations. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.

Hotline History
Component Test Code*Component Chart NameLOINC
0080065Carnitine, Free14286-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please view this test within the Laboratory Test Directory found at
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