Test Details
Methodology
High-pressure liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Result 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.
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.
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 Instructions
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.
Stability Requirements
Temperature | Period |
|---|---|
Frozen | 14 days |
Storage Instructions
Freeze.
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 | 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 |
| Order Code | 706500 | |||||
| Order Code Name | Carnitine, Total and Free | |||||
| Order Loinc | 79285-3 | |||||
| Result Code | 706501 | |||||
| Result Code Name | Carnitine, Total | |||||
| UofM | umol/L | |||||
| Result LOINC | 14288-5 | |||||
| Order Code | 706500 | |||||
| Order Code Name | Carnitine, Total and Free | |||||
| Order Loinc | 79285-3 | |||||
| Result Code | 706502 | |||||
| Result Code Name | Carnitine, Free | |||||
| UofM | umol/L | |||||
| Result LOINC | 14286-9 | |||||
| Order Code | 706500 | |||||
| Order Code Name | Carnitine, Total and Free | |||||
| Order Loinc | 79285-3 | |||||
| Result Code | 706503 | |||||
| Result Code Name | Esterified/Free | |||||
| UofM | Ratio | |||||
| Result LOINC | 40869-0 |