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how long will fentanyl show up in urine.
tia!

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Fentanyl is difficult to test for. It does not show up in the urine dip stick type tests, although some forms of this test are starting to show up. The accuracy and validity of the tests are not yet proven.

Liquid chromatography/mass spectrometry is currently used to detect fentanyl. Fentanyl and its two metabolites (norfentanyl and despropionylfentanyl) are detectable in urine for at least 24 hours. By 72 hours, fentanyl is undetectable. Norfentanyl is present in larger quantities than fentanyl and is detected up to 96 hours after ingestion.
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Is GC MS testing more or less accurate than liquid chromatography/mass spectrometry in detecting fentanyl metabolites?
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