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Test ID CARNS Carnitine, Serum

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 using serum specimens

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Necessary Information


Patient's age is required.



Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL Serum

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Specimen Stability Information

Specimen Type Temperature Time
Serum 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(4):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 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK