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HelpTest Code CARN Carnitine, Plasma
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
PlasmaNecessary Information
Patient's age is required.
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Green top (sodium heparin)
Acceptable: Lavender top (EDTA), green top (lithium heparin)
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot plasma into a plastic vial
Specimen Minimum Volume
0.2 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Plasma | Frozen (preferred) | 60 days | |
| Refrigerated | 21 days | ||
| Ambient | 7 days |
Reference Values
|
|
Total carnitine (TC) |
Free carnitine (FC) |
Acylcarnitine (AC) |
AC/FC Ratio |
|
Age Group |
Range* |
Range* |
Range* |
Range |
|
≤1 day |
23-68 |
12-36 |
7-37 |
0.4-1.7 |
|
2-7 days |
17-41 |
10-21 |
3-24 |
0.2-1.4 |
|
8-31 days |
19-59 |
12-46 |
4-15 |
0.1-0.7 |
|
32 days-12 months |
38-68 |
27-49 |
7-19 |
0.2-0.5 |
|
13 months-6 years |
35-84 |
24-63 |
4-28 |
0.1-0.8 |
|
7-10 years |
28-83 |
22-66 |
3-32 |
0.1-0.9 |
|
11-17 years |
34-77 |
22-65 |
4-29 |
0.1-0.9 |
|
≥18 years |
34-78 |
25-54 |
5-30 |
0.1-0.8 |
*Values expressed as nmol/mL
Schmidt-Sommerfeld E, Werner E, Penn D: Carnitine plasma concentrations in 353 metabolically healthy children. Eur J Pediatr. 1988;147:356-360
Used with permission of European Journal of Pediatrics.
Day(s) Performed
Monday through Friday
CPT Code Information
82379
Report Available
3 to 5 daysReject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Method Name
Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.