Ordering RecommendationRecommendations when to order or not order the test. May include related or preferred tests.
Useful in the diagnosis of primary carnitine deficiency (carnitine uptake defect). Monitor carnitine status.
MnemonicUnique test identifier.
CARN F&T
MethodologyProcess(es) used to perform the test.
Tandem Mass Spectrometry
PerformedDays of the week the test is performed.
Tue-Sat
ReportedExpected turnaround time for a result, beginning when ARUP has received the specimen.
1-4 days
New York DOH Approval StatusIndicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect
Green (sodium or lithium heparin). Also acceptable: Plain red.
Specimen Preparation
Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum or plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.2 mL) Avoid hemolysis.
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Unacceptable Conditions
Room temperature specimens. Specimens refrigerated greater than 12 hours.
Remarks
Stability
After separation from cells: Ambient: Unacceptable; Refrigerated: 12 hours; Frozen: 1 month (avoid repeated freeze/thaw cycles)
Reference IntervalNormal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Age
Carnitine, Free, Serum/Plasma
Carnitine, Total, Serum/Plasma
Carnitine, Esterified, Serum/Plasma
Carnitine E/F Ratio, Serum/Plasma
1 - 31 days
15 - 55 µmol/L
21 - 83 µmol/L
4 - 29 µmol/L
0.2 - 0.8
32 days-12 months
29 - 61 µmol/L
38 - 73 µmol/L
7 - 24 µmol/L
0.1 - 0.8
13 months - 6 years
25 - 55 µmol/L
35 - 90 µmol/L
4 - 36 µmol/L
0.1 - 0.8
7 years -20 years
22 - 63 µmol/L
31 - 78 µmol/L
3 - 38 µmol/L
0.1 - 0.9
21 years or older
25 - 60 µmol/L
34 - 86 µmol/L
5 - 29 µmol/L
0.1 - 1.0
Interpretive DataBackground information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
Compliance Category
Laboratory Developed Test (LDT)
NoteAdditional information related to the test.
The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.
CPT CodesThe American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
AliasesOther names that describe the test. Synonyms.
Esterified carnitine
Free and Total Carnitine
L-Carnitine Free and Total
Carnitine, Free & Total (Includes Carnitine, Esterified)
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