Carnitine, Free and Total, Urine by Tandem Mass Spectrometry

Carnitine, Free and Total, Urine by Tandem Mass Spectrometry Print

Test Mnemonic

UCARFT

CPT Codes

82379 - QTY (1)

Includes

Creatinine, Urine
Carnitine, Free, Urine
Carnitine, Total, Urine
Carnitine, Esterified, Urine
Carnitine, E/F Ratio, Urine

Performing Laboratory

ARUP

FDA Category

Laboratory Developed Test

Specimen Requirements

Volume	Type	Container	Collect Temperature	Transport Temperature	Special Instructions
5 mL	Urine, random	Clean container		Frozen, Critical	CRITICAL FROZEN. Freeze immediately after collection. Separate specimens must be submitted when multiple tests are ordered.

Minimum Specimen Requirements

Volume	Type	Container	Collect Temperature	Transport Temperature	Special Instructions
2 mL

Stability

Environmental Condition	Description
Frozen	1 month
Refrigerated	Unacceptable
Ambient	Unacceptable

Days Performed

Tue

Turnaround Time

3 - 10 days

Methodology

Name	Description
Tandem Mass Spectrometry (MS-MS)

Reference Range

Carnitine,E/F Ratio,Ur
Sex	Age From	Age To	Type	Range	Range Unit
	Months	5 Months	Normal	0.4 - 6.8	Ratio
	6 Months	23 Months	Normal	0.4 - 5.0	Ratio
	2 Years	99 Years	Normal	0.5 - 7.3	Ratio
Carnitine,Esterified,Ur
Sex	Age From	Age To	Type	Range	Range Unit
	Months	5 Months	Normal	138 - 525 Creatinine	umol/g
	6 Months	23 Months	Normal	175 - 613 Creatinine	umol/g
	2 Years	99 Years	Normal	55 - 317 Creatinine	umol/g
Carnitine,Free, Ur
Sex	Age From	Age To	Type	Range	Range Unit
	Months	5 Months	Normal	16 - 922 Creatinine	umol/g
	6 Months	23 Months	Normal	37 - 1066 Creatinine	umol/g
	2 Years	99 Years	Normal	7 - 407 Creatinine	umol/g
Carnitine,Total, Ur
Sex	Age From	Age To	Type	Range	Range Unit
	Months	5 Months	Normal	160 - 1552 Creatinine	umol/g
	6 Months	23 Months	Normal	231 - 1710 Creatinine	umol/g
	2 Years	99 Years	Normal	73 - 731 Creatinine	umol/g

Special Info

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. Refrigerated or room temperature specimens will be rejected. This test is New York DOH approved.

Clinical Info

Useful in the diagnosis of primary carnitine deficiency (carnitine uptake defect) in conjunction with free and total plasma carnitine. The concentration of esterified carnitine is derived from a mathematical calculation using free and total carnitine.