Carnitine, Total and Free

CPT: 82379
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Test Details

Synonyms

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

Use

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.

Limitations

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).

Methodology

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

Specimen Requirements

Specimen

Serum or plasma, frozen

Volume

2.5 mL

Minimum Volume

1.5 mL

Container

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

Collection

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

Freeze.

Stability Requirements

Temperature

Period

Frozen

14 days

Causes for Rejection

Specimen not frozen

LOINC® Map

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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CPT Statement/Profile Statement

The LOINC® codes are copyright © 1994-2017, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf