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Doctor insights on: Fentanyl And Norfentanyl Urine

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How long are fentanyl metabolites detectable on a urine sample tested specifically for fentanyl?

How long are fentanyl metabolites detectable on a urine sample tested specifically for fentanyl?

Quite a bit of time: the first thing is that fentanyl is a long acting drug mainly because of the time it takes to get out of the patch and into the person. The time starts hours after the patch is removed. Due to some staying in the skin, it brings the total time to about a week after the patch is rmoved. ...Read more

Urine (Definition)

Urine is the product of the kidneys, which is produced to eliminate the waste products of metabolism, manage body fluid balance, &maintain acid-base balance. The blood is first filtered by the kidneys, and the composition of the resulting fluid is then altered depending on the body's needs. It is composed of mostly water, and breakdown products from blood cells impart ...Read more


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What would cause a false negative urine drug test for fentanyl patches?

Errors: 1. Not wearing the patch, an exhausted patch, a placebo patch 2. The test was not specific for fentanyl 3. Lab error 4. Specimen misidentification. ...Read more

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Do home hair follicle tests show fentanyl? Will fentanyl show up in a standard urine test given by a dr?

Do home hair follicle tests show fentanyl? Will fentanyl show up in a standard urine test given by a dr?

Fetanyl: There are non dot tests in the urine that can find it. At times it will be disclosed as an opiate and not specify the type. Dot tests will not find it. The hair testing non dot can find it up to 3 months after use. ...Read more

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Heard my daughters puttin her fentanyl patches under her tonge an not puttin em on,even if i had dr do urine/spit test sent to lab it wont tell differ?

Difficult to say: Urine test will show the drug is in her system. Saliva test will show it too for up to 2 - 5 days after the last dose. The test will simply stay it is in her system, not the mode of entry. Scraping the oral mucosa after chewing could detect it. You need to do something quickly to stop this behavior. Overdose is almost inevitable when Fentanyl is chewed and will occur at some point. ...Read more

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Will fentanyl show up on a normal 12 panel urine test? Friend has an Rx for percocet. Will fentanyl influence the results of his oxycodone levels too?

Will fentanyl show up on a normal 12 panel urine test? Friend has an Rx for percocet. Will fentanyl influence the results of his oxycodone levels too?

Most likely: Fentanyl will most likely show up as a positive test for opioids on a 12 panel urine drug screen. The panel does not have a specific test for fentanyl in the panel, but fentanyl is an opioid. There is a specific for oxycodone on the test that should be positive in someone taking Percocet. It is strongly recommended that a person be completely honest about what drugs have been used prior to test ...Read more

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Will fentanyl show up on a urine drug screen saying it is only testing for opiates and benzos? Not specifically fentanyl though

Will fentanyl show up on a urine drug screen saying it is only testing for opiates and benzos? Not specifically fentanyl though

Fentanyl: IS an opiate but does not show up on routine urine testing HOWEVER many Companies ask for COMPLETE drug screening which can include Fentanyl testing so don't "figure" you can use Fentanyl and pass your test!!!! The half life is about 12 hours thus it will show up for a few days after use! the HAIR will be positive for a lot longer time! Dr Z ...Read more

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Since being on fentanyl patches for back pain I keep getting sores on lips and tongue, urine retention, sore throat, and I'm very weak. Please help.

Fentanyl patches: Sores on the lips and tongue are probably not related. The urine and weak certainly could be related. This is probably an issue related to the dose. What does did you start on? ...Read more

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