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Test ID FENR Fentanyl Screen with Reflex, Random, Urine


Ordering Guidance


For situations where chain of custody is required, a Chain of Custody Kit (T282) is available. For chain-of-custody testing, order FENTX / Fentanyl with Metabolite Confirmation, Chain of Custody, Urine.

 

For monitoring therapeutic drug levels, order FENTS / Fentanyl, Serum.



Additional Testing Requirements


If urine creatinine is required or adulteration of the sample is suspected, the following test should also be ordered, ADULT / Adulterants Survey, Random, Urine.



Specimen Required


Supplies: Urine Tubes, 10 mL (T068)

Collection Container Tube: Plastic urine container

Submission Container/Tube: 10 mL tube

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.


Forms

If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.

Useful For

Screening for drug abuse or use involving fentanyl, and confirmation of fentanyl if present in the screen

Profile Information

Test ID Reporting Name Available Separately Always Performed
FENS Fentanyl Screen, U Yes Yes

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
FENTU Fentanyl w/metabolite Conf, U Yes No

Testing Algorithm

Testing begins with a screening assay. If the fentanyl screen is positive, then the liquid chromatography-tandem mass spectrometry confirmation with quantification will be performed at an additional charge.

Method Name

Immunoassay

Reporting Name

Fentanyl Screen w/Reflex, U

Specimen Type

Urine

Specimen Minimum Volume

2.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Clinical Information

This procedure uses immunoassay reagents that are designed to produce a negative result when no drugs are present in a natural (ie, unadulterated) specimen of urine; the assay is designed to have a high true-negative rate. Like all immunoassays, it can have a false-positive rate due to cross-reactivity with natural chemicals and drugs other than those they were designed to detect. The immunoassay also has a false-negative rate to the antibody's ability to cross-react with different drugs in the class being screened for.

Reference Values

Negative

Screening cutoff concentration: 2 ng/mL

Cautions

Care should be taken when interpreting results since there are many factors (eg, fluid intake and other biologic factors) that may influence a urine test result. It is possible that substances other than those investigated in the specificity study may interfere with the test and cause either false-positive or false-negative results.

Day(s) Performed

Monday through Saturday

Report Available

Same day/1 to 2 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

80307

NY State Approved

Yes