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Carnitine, plasma

Item Value
Approval req'd? No
Available Stat? No
Test code CARN
Test group Carnitine
Performed by Lucille Packard Children's Hospital
Sendout? Yes
Method Stable isotope dilution LC-MS/MS
Container type Dark Green top (Do not use Light. green top)
Note:Red or Gold top required for B&T patients)
Amount to Collect 2 mL blood
Sample type Heparinized plasma (Note: Serum is required for B&T patients)
Preferred volume 1 mL plasma (Serum for B&T patients)
Min. Volume 0.5 mL plasma (Serum for B&T patients)
Processing notes Separate plasma and freeze at -20C. Ship frozen via Medical Courier to Lucille Packard Children's Hospital.

LabCorp requires serum for testing
Units µmol/L
Normal range
Total carnitine 20-71 µmole/L
Free carnitine 18-69 µmole/L
Acyl/Free ratio 0.1-0.4
Turn around times Run 2x per week, turnaround 7-9 days
Additional information Free and Total carnitine levels are measured. Results include a calculation of the ratio of acylcarnitine (esterified fraction) to free carnitine. The test is used to identify patients with either primary carnitine deficiency (i.e. carnitine uptake defect) or secondary carnitine deficiency arising from inherited defects in fatty acid or organic acid metabolism.
CPT coding 82379-90
LOINC code 14288-5
Last Updated 10/2/2010 11:51:31 AM
Entry Number 169
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