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Why would drug test show negative while taking Fentanyl?

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Why would my drug test show a negative when tested at Dr. office while taking FentaNYL patch 150 mcg? How is this possible?
Posted Tue, 1 Oct 2013 in Medicines and Side Effects
Answered by Dr. Chakravarthy Mazumdar 12 minutes later
Brief Answer:
Depends on the concentrate and the stip used

Detailed Answer:

Was it a urine or blood drug test?
The concentration of the drug varies from individual to individual. It also depends on what strip was used and if it can detect opioids.

Second, transdermal patches do not deliver as much drug as Injections or oral drugs deliver to the body, the 150mcg conc is too low to be detected for a routine drug test.

Hope this answers to it.
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