Fentanyl , Urine Screen with Reflex to Quantitation
Also known as: FENT RFX U
Use
This test is useful for general screening in contexts of compliance and/or abuse. A screen with reflex testing is the preferred method for ruling out fentanyl exposure. For follow-up testing of a presumptive positive result, the Fentanyl and Metabolite, Urine Quantitative test is preferred.
Special Instructions
If the specimen screens positive, a Confirmation/Quantitation by LC-MS/MS (ARUP test code 0092570) will be added to confirm the result. Additional charges apply for reflex testing.
Limitations
Presumptive negative results for drug(s) and/or drug metabolite(s) may indicate non-compliance, inappropriate timing of specimen collection relative to drug administration, poor drug absorption, diluted/adulterated urine, or limitations of the testing method. The concentration at which the screening test can detect a drug or metabolite varies within a drug class. This test is for medical purposes only and not valid for forensic use.
New York Approved
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 54247-2
- 11235-9
Result Turnaround Time
1-4 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
4 mL
Minimum Volume
1 mL
Container
ARUP Standard Transport Tubes
Collection Instructions
Collect random urine with no additives or preservatives.
Storage Instructions
Store at room temperature.
Causes for Rejection
Specimens exposed to repeated freeze/thaw cycles or collected in tubes with additives or preservatives.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 week |
| Refrigerated | 1 month |
| Frozen | 1 month |
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