Understanding Your Medical Test: A Complete Patient Guide to Testing, Results, and Preparation
This test checks for the presence of p-Fluorofentanyl, a synthetic opioid, in your urine sample using a confirmatory method.
{"Detects p-Fluorofentanyl, a fentanyl analog, in urine","Used to monitor substance use or verify abstinence","Results are reported as Present or Not Detected","A positive result may indicate opioid use"}
Key facts at a glance
- LOINC
- 101162-6
- Short code
- pFFU
- Synonyms
- 4-Fluorofentanyl Ur Ql Cfm
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container ( polypropylene or glass)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 12–100 years
- Method
- confirm
- CPT
- 80307
- SNOMED
- 122465009
- Specimen volume
- 5-10 mL preferred, minimum 2 mL
- Stability
- Room temperature: 7 days; Refrigerated (2-8°C): 14 days; Frozen (-20°C): 30 days
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 48–96 hours
- Order
- routine
What is this test and why might my health care provider recommend it for me?
The p-Fluorofentanyl urine test is a laboratory test that detects the presence of p-Fluorofentanyl in your urine. p-Fluorofentanyl is a synthetic opioid that is chemically related to fentanyl, a powerful pain medication. This test uses a confirmatory method, which is a more specific and accurate testing approach than initial screening tests.
How is the test performed, and what can I expect during the procedure?
A urine sample is collected from you and sent to a laboratory for analysis. The confirmatory method typically uses mass spectrometry techniques to accurately identify the presence of p-Fluorofentanyl and its metabolites. This method is highly specific and can distinguish p-Fluorofentanyl from other similar compounds.
What do the results mean, and how will they be used to guide my care?
Your test results will show either 'Present' (or Positive) or 'Not Detected' (or Negative). A 'Present' result means that p-Fluorofentanyl was found in your urine sample. A 'Not Detected' result means that no p-Fluorofentanyl was found at the detection limit of the test. Your healthcare provider will interpret these results in the context of your medical history and treatment plan.
Are there any risks, side effects, or special preparations I should know about beforehand?
This test requires only a routine urine sample, which has minimal risks. There are generally no special preparations needed, but you should follow any specific instructions from your healthcare provider. Be sure to inform your provider about any medications or substances you may have taken, as certain substances might affect the test results.
Reference range
Not Detected (Cutoff: 0.5 ng/mL)N/A
Collect random urine sample in sterile container. Avoid contamination of sample. Inform laboratory of any prescribed medications or supplements. No fasting required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The p-Fluorofentanyl urine test is used in several clinical settings: monitoring patients in opioid addiction treatment programs, verifying abstinence from opioid use as part of compliance testing, detecting exposure to synthetic opioids in clinical or occupational settings, and supporting pain management programs where opioid use needs to be monitored.
p-Fluorofentanyl is a potent synthetic opioid with a high risk of overdose, especially when combined with other substances. Testing helps healthcare providers identify use and provide appropriate intervention, treatment, or support. This test is particularly important given the ongoing opioid crisis and the prevalence of synthetic opioids in the illegal drug supply.
Frequently asked questions
How long does p-Fluorofentanyl stay in urine?
Can a positive result affect my treatment?
Will I test positive if I take prescription fentanyl?
Can second-hand exposure cause a positive result?
Sources
- 1
- 2CDC - Fentanyl FactsSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy