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HelpTest ID CARNU Carnitine, Random, Urine
Useful For
Evaluation of patients with a clinical suspicion of a wide range of conditions including organic acidemias and fatty acid oxidation disorders
Monitoring carnitine treatment
Highlights
Carnitine levels are disturbed in primary disorders of the carnitine cycle, or secondary disturbances of carnitine metabolism due to other biochemical disorders.
While plasma or serum carnitine is reduced in primary carnitine deficiency, urine carnitine may be normal or elevated.
Dietary intake (meat, carnitine supplementation) may cause increased carnitine values.
Abnormal results are accompanied by detailed interpretation including recommendations for follow-up testing.
Method Name
Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)
Reporting Name
Carnitine, USpecimen Type
UrineSpecimen Required
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube
Specimen Volume: 1.5 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Frozen (preferred) | 365 days | |
| Refrigerated | 72 hours |
Reference Values
FREE CARNITINE:
77-214 nmol/mg of creatinine
TOTAL CARNITINE:
180-412 nmol/mg of creatinine
RATIO:
Acylcarnitine to free carnitine: 0.7-3.4
Day(s) Performed
Tuesday
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
82379
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CARNU | Carnitine, U | 100428-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 27121 | Total | 17866-5 |
| 27122 | Free (FC) | 17867-3 |
| 15789 | AC/FC Ratio | 43576-8 |
| 21550 | Interpretation | 59462-2 |
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.Report Available
3 to 9 daysNY State Approved
YesForms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.