Find Locations
For hours, walk-ins and appointments.Expected Turnaround Time
3 - 6 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Documents
Specimen Requirements
Specimen
Serum, plasma, or whole blood
Volume
0.25 mL
Minimum Volume
0.05 mL
Container
Red-top tube, lavender-top (EDTA) tube, or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.
Collection
Separate serum or plasma within two hours of collection and transfer to a plastic transport tube.
Storage Instructions
Maintain specimen at room temperature.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 14 days |
Refrigerated | 14 days |
Frozen | 14 days |
Causes for Rejection
Gel-barrier tube
Test Details
Use
Relief of pain adjunct to general or regional anesthesia moderate to moderately-severe pain. Indications for monitoring include the following: to confirm or identify suspected drug toxicity in chronic use, therapeutic misadventure, or accidental or intentional acute overdose; to aid in the identification of an unknown drug ingested in unknown quantities, drug identification and/or quantitation may be performed as an adjunct for patient management; to monitor selected patient groups at greater risk for analgesic drug toxicity or drug-to-drug interaction; to confirm complete drug absorption and adequate drug elimination as an adjunct to overdose management.
Limitations
This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.
Methodology
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
References
Drug Information Handbook. 24th ed. Hudson, OH: Wolters Kluwer Clinical Drug Information, Inc; 2015; 857-868.
White S, Wong SH. Standards of laboratory practice: Analgesic drug monitoring. National Academy of Clinical Biochemistry. Clin Chem. 1998 May; 44(5):1110-1123. 9590395
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 071543 | Fentanyl and Metabolite | 071539 | Fentanyl | ng/mL | 3636-8 | |
| 071543 | Fentanyl and Metabolite | 071541 | Norfentanyl | ng/mL | 11074-2 |
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