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HelpTest Code LAB1941 Carnitine, Urine
Clinical System Name
Carnitine Free and Total, Urine
Synonyms
U CarnFrT
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, F | 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 |