Carnitine, Total and Free

TEST: 706500
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CPT: 82379
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Synonyms

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

Expected Turnaround Time

3 - 6 days

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Related Documents

Specimen Requirements

Specimen

Serum or plasma, frozen

Volume

2.5 mL

Minimum Volume

0.2 mL (Note: This volume does not allow for repeat testing.)

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

Test Details

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 Food and Drug Administration.

Methodology

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

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
706500 Carnitine, Total and Free 79285-3 706501 Carnitine, Total umol/L 14288-5
706500 Carnitine, Total and Free 79285-3 706502 Carnitine, Free umol/L 14286-9
706500 Carnitine, Total and Free 79285-3 706503 Esterified/Free Ratio 40869-0

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