Carnitine, Free & Total (Includes Carnitine, Esterified)
0080068
 
Ordering Recommendation
Mnemonic
CARN F&T
Methodology
Tandem Mass Spectrometry
Performed
Tue-Sat
Reported
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
 
Collect
Green (sodium or lithium heparin). Also acceptable: Plain red.  
Specimen Preparation
Separate serum or plasma from cells 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 refrigerated greater than 12 hours.  
Remarks
 
Stability
After separation from cells: Ambient: Unacceptable; Refrigerated: 12 hours; Frozen: 1 month (avoid repeated freeze/thaw cycles)  
Reference Interval
Age Free Carnitine Total Carnitine Esterified Carnitine Ratio Esterified: Free
1 -​ 31 days 15 -​ 55 µmol/L 21 -​ 83 µmol/L 4 -​ 29 µmol/L 0.2 -​ 0.8
32 days-​12 months 29 -​ 61 µmol/L 38 -​ 73 µmol/L 7 -​ 24 µmol/L 0.1 -​ 0.8
13 months -​ 6 years 25 -​ 55 µmol/L 35 -​ 90 µmol/L 4 -​ 36 µmol/L 0.1 -​ 0.8
7 years -​20 years 22 -​ 63 µmol/L 31 -​ 78 µmol/L 3 -​ 38 µmol/L 0.1 -​ 0.9
21 years or older 25 -​ 60 µmol/L 34 -​ 86 µmol/L 5 -​ 29 µmol/L 0.1 -​ 1.0
Interpretive Data


See Compliance Statement B: www.aruplab.com/CS
Note
The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.
CPT Code(s)
82379
Components
Component Test Code*Component Chart Name
0080064Carnitine, Esterified
0080066Carnitine, Free
0080067Carnitine, Total
0081148Carnitine Esterified/Free (Ratio)
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
  • Esterified carnitine
  • Free and Total Carnitine
  • L-Carnitine Free and Total