Test Overview
Test Methodology

Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)

Test Usage

Evaluation of patients with a clinical suspicion of a wide range of conditions including organic acidemias, fatty acid oxidation disorders, and primary carnitine deficiency.

Reference Range *

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Increased values may be obtained after carnitine supplementation or meat consumption.

Test Details
Days Set Up
Monday - Friday
Analytic Time

2 - 5 days

Soft Order Code
CARNS
MiChart Code
Carnitine, Serum
Synonyms
  • CARNS
  • Carnitine, Serum
  • Acylcarnitine
  • Carnitine, Free and Total
  • AC/FC Ratio
  • L-Carnitine
Laboratory
Sendout
Reference Laboratory
Mayo CARNS (60449)
Section
Special Testing
Specimen Requirements
Collection

Collect specimen in a red top (preferred) or SST tube. Centrifuge, aliquot serum into a plastic vial and freeze.

Red Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.2 mL serum
Storage Temperature
Frozen: 60 days, Refrigerated: 21 days.
Additional Information

Test includes Total Carnitine, Free Carnitine, Acylcarnitine, and AC/FC Ratio. Test sent to Mayo Medical Laboratories.

Billing
CPT Code
82379
Fee Code
20459
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