Useful in the diagnosis of primary carnitine deficiency (carnitine uptake defect) in conjunction with free and total plasma carnitine.
Tandem Mass Spectrometry
New York DOH Approval Status
Freeze specimen immediately after collection. Transport 5 mL urine. (Min: 2 mL)
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Refrigerated or room temperature specimens.
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
|0081307||Carnitine, Total, Urine (INACTIVE as of 11/16/20: Refer to 0081308)||0-5 months: 160-1552 µmol/g creatinine
6-23 months: 231-1710 µmol/g creatinine
2 years and older: 73-731 µmol/g creatinine
|0081309||Carnitine, Free, Urine (INACTIVE as of 11/16/20: Refer to 0081308)||0-5 months: 16-922 µmol/g creatinine
6-23 months: 37-1066 µmol/g creatinine
2 years and older: 7-407 µmol/g creatinine
|Carnitine, Esterified, Urine||0-5 months: 138-525 µmol/g creatinine
6-23 months: 175-613 µmol/g creatinine
2 years and older: 55-317 µmol/g creatinine
|Carnitine, E/F Ratio, Urine||0-5 months: 0.4-6.8
6-23 months: 0.4-5.0
2 years and older: 0.5-7.3
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.
|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|
- Urinary Carnitine, Quantitative