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0081308
Carnitine, Free and Total, Urine
CARN URINE
Ordering Recommendation
Useful in the diagnosis of primary carnitine deficiency (carnitine uptake defect) in conjunction with free and total plasma carnitine.
New York DOH Approval Status
This test is New York state approved.
Specimen Required
Patient Preparation
Collect
Random urine.
Specimen Preparation
Freeze specimen immediately after collection. Transport 5 mL urine. (Min: 2 mL)
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Unacceptable Conditions
Refrigerated or room temperature specimens.
Remarks
Stability
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
Methodology
Tandem Mass Spectrometry
Performed
Mon
Reported
2-9 days
Reference Interval
| Test Number |
Components |
Reference Interval |
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|---|---|---|---|---|---|---|---|---|---|---|
| Carnitine, Total, Urine |
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| Carnitine, Free, Urine |
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| Carnitine, Esterified, Urine |
|
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| Carnitine, E/F Ratio, Urine |
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Interpretive Data
Compliance Category
Laboratory Developed Test (LDT)
Note
The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.
Hotline History
N/A
CPT Codes
82379
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0081307 | Carnitine, Total, Urine | 17866-5 |
| 0081309 | Carnitine, Free, Urine | 17867-3 |
| 0081310 | Carnitine, Esterified, Urine | 28589-0 |
| 0081311 | Carnitine, E/F Ratio, Urine | 54442-9 |
| 2001266 | Creatinine, Urine | 2161-8 |
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
- L-Carnitine
- Urinary Carnitine, Quantitative
Carnitine, Free and Total, Urine
