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How long before Fentanyl can no longer be detected in basic blood work or a urine test?
Wiki User
∙ 13y ago
In a study of 7 patients given fentanyl in surgery -
Fentanyl and its two metabolites (norfentanyl and despropionylfentanyl) were extracted from samples and analyzed by gas chromatography/mass spectrometry.
Unchanged fentanyl was detectable in urine in all patients immediately postoperatively and in 3 of 7 patients at 24 hours.
By 72 hours, fentanyl was undetectable.
Norfentanyl was present in larger quantities than fentanyl immediately postoperatively and was detected in all patients at 48 hours and in 4 of 7 patients at 96 hours.
Wiki User
∙ 13y ago
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