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Test Code CARNTM Carnitine, Plasma

Additional Codes

MAYO Test ID

CARN

EPIC Test ID

LAB815

 

Reporting Name

Carnitine, P

Useful For

Evaluation of patients with a clinical suspicion of a wide range of conditions including organic acidemias, fatty acid oxidation disorders, and primary carnitine deficiency in plasma specimens

Method Name

Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Plasma


Specimen Required


Collection Container/Tube:

Preferred: Green top (sodium heparin)

Acceptable: EDTA, lithium heparin

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL


Specimen Minimum Volume

0.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Plasma Frozen (preferred) 60 days
  Refrigerated  21 days
  Ambient  7 days

Reject Due To

Hemolysis

Mild OK; Gross OK

Lipemia

Mild OK; Gross OK

Icterus

Mild OK; Gross OK

Other

Plasma gel tube

 

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, Springer-Verlag, New York, Inc., Secaucus, NJ

Day(s) and Time(s) Performed

Monday through Friday; 8 a.m.

CPT Code Information

82379

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CARN Carnitine, P In Process

 

Result ID Test Result Name Result LOINC Value
32050 Total 14288-5
32051 Free (FC) 14286-9
32052 Acylcarnitine (AC) 14282-8
21032 AC/FC Ratio 30193-7
21549 Interpretation 59462-2

Analytic Time

2 days (not reported on Saturday or Sunday)

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.