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SBMF No:
44376
Performance Lab Name:
ARUP Laboratories
Test Mnemonic:
CARN F/T
ABN:
Not required
CPT Code:
82379
LOINC Code:
40869-0; 14286-9; 14288-5; 14282-8
Ref Lab Test No:
0080068
Test Includes:
Carnitine, Total
Carnitine, Free
Carnitine, Esterified (Calculated)
Also Known As:
L-carnitine Free & Total
Also See:
44907 Carnitine Panel
Spec Type:
Plasma
Spec Container:
Green top (heparin) tube
Alt Spec Type:
Serum
Alt Spec Container:
Red top (serum) tube
Pref Vol:
0.5 mL
Min Vol:
0.2 mL
Fasting:
No
Patient Prep:
Form required: "Patient History for Biochemical Genetic Testing"
Spec Collect:
Routine venipuncture
Spec Process:
Serum sample tubes, clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum or plasma to separate plastic tube and freeze
Spec Store Transport:
Frozen
Spec Stability:
After separation from cells:
Room temperature: Unacceptable
12 hours refrigerated (2-8°C)
1 month frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles
Spec Reject:
Room temperature sample
Sample refrigerated greater than 12 hours
Spec Remarks:
CRITICAL FROZEN – Separate samples must be submitted when multiple tests are ordered
Separate serum or plasma from cells and freeze ASAP or within 2 hours of collection
Avoid hemolysis
Methodology:
Tandem Mass Spectrometry (MS/MS)

Reference Range:

Age	Free Carnitine	Total Carnitine	Esterified Carnitine	Ratio Esterified : Free
1-31 days 32 days-12 months 13 months-6 years 7-20 years 21 years and older	15-55 µmol/L 29-61 µmol/L 25-55 µmol/L 22-63 µmol/L 25-60 µmol/L	21-83 µmol/L 38-73 µmol/L 35-90 µmol/L 31-78 µmol/L 34-86 µmol/L	4-29 µmol/L 7-24 µmol/L 4-36 µmol/L 3-38 µmol/L 5-29 µmol/L	0.2-0.8 0.1-0.8 0.1-0.8 0.1-0.9 0.1-1.0

Note:
The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.