Carnitine, Free & Total (Includes Carnitine, Esterified) CARFT

Method(s) Tandem Mass Spectrometry
Specimen Required
Collect

One 3 mL green (sodium or lithium heparin) top tube. Also acceptable: Plain red top tube.

Transport 0.5 mL plasma, frozen (Min: 0.2 mL)
Remarks

CRITICAL FROZEN. Separate samples must be submitted when multiple tests are ordered. Separate plasma from cells ASAP or within 2 hours of collection. Avoid hemolysis.

Stability After separation from cells: Ambient: Unacceptable; Refrigerated: 12 hours; Frozen: 1 month (avoid repeated freeze/thaw cycles)
Unacceptable Conditions Ambient specimens. Specimens refrigerated greater than 12 hours.
Schedule Tue-Sat
Billing Code 5010102
CPTCode 82379
Notes The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.
Preferred Specimen Collection Device(s)
Reference Interval
AgeFree CarnitineTotal CarnitineEsterified CarnitineRatio
Esterified: Free
1-31 days15 - 55 µmol/L21 - 83 µmol/L4 - 29 µmol/L0.2 - 0.8
32 days-12 months29 - 61 µmol/L38 - 73 µmol/L7 - 24 µmol/L0.1 - 0.8
13 months - 6 yrs25 - 55 µmol/L35 - 90 µmol/L4 - 36 µmol/L0.1 - 0.8
7 yrs - 20 yrs22 - 63 µmol/L31 - 78 µmol/L3 - 38 µmol/L0.1 - 0.9
21 yrs or older25 - 60 µmol/L34 - 86 µmol/L5 - 29 µmol/L0.1 - 1.0
No Appointment Necessary
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11 Patient Service Centers in Central New York.

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