Carnitine, Total and Free

CPT: 82379
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Test Details


  • Carnitor®/Carnitor® SF
  • L-Carnitine®
  • Levocarnitine


The analysis of carnitines is indicated in patients who exhibit the following: failure to thrive, hypotonia, chronic muscle weakness, cardiomyopathy, intermittent episodes of weakness and encephalopathy, renal Fanconi's syndrome, hypoglycemic episodes, metabolic acidosis, or hypoketotic dicarboxylic acidurias.


This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).


High-pressure liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Specimen Requirements


Serum or plasma, frozen


2.5 mL

Minimum Volume

0.3 mL


Red-top tube, gel-barrier tube, or green-top (heparin) tube


Transfer separated serum or plasma to a plastic transport tube and freeze. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions


Stability Requirements




14 days

Causes for Rejection

Specimen not frozen


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
706500 Carnitine, Total and Free 706501 Carnitine, Total umol/L 14288-5
706500 Carnitine, Total and Free 706502 Carnitine, Free umol/L 14286-9
706500 Carnitine, Total and Free 706503 Esterified/Free Ratio 40869-0
706500 Carnitine, Total and Free 700474 Disclaimer: N/A

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