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Test Code U CarnFrT Carnitine, Urine

Clinical System Name

Carnitine Free and Total, Urine

Description

Quantitation of free, total, and acylcarnitine by LC/MS/MS

 

Sample Requirements

Specimen: Urine

Container(s): Sterile Screw-Capped Countainer/Tube,

Preferred Vol:  5.0 mL

Minimum Vol: 5.0 mL

 

Note:  No preservatives.

 

 

Processing Instructions

Reject due to:

Spin:N

Aliquot:N

Temp:-20 C

Storage location: -20 C BCG  Box

 

Off-site collection: Freeze sample immediately, ship frozen.

Stability

Temperature Time
Room temp <24 hrs
Refrigerated 3 days
Frozen 1 yr

 

Availability

STAT Performed TAT
N T, Th 3-7 days

 

Contact the Biochemical Genetics Lab for requests outside of stated availability (206)987-2216.

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Biochemical Genetics

Phone Number: 206-987-2216

 

 

Methodology

Method: Tandem Mass Spectrometry

Analytical Volume: 0.2 mL

Limitations:

CPT Codes

82379

Requisition

Biochemical Genetics Requisition

 

Method is affected by patient's diet and medication.  Please include clinical information needed for appropriate interpretation.  (Age, gender, diet (e.g. TPN therapy), drug therapy and family history)

Clinical Utility

Assessment of renal carnitine loss.

Reference Ranges

  nmole/mg creatinine
Total Carnitine 35 - 275
Free Acylcarnitine 0 - 227
Acylcarnitine 35 - 170
Acyl Free Ratio < 4