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Fentanyl Patch Question

I made a mistake with my calendar.  I'm supposed to change patch every 3 days, but I forgot and didn't replace my patch until later on the 4th.  I had my urine test sent in on that 4th day and I just realized what I did!  It would be ok but I want to make sure the fentanyl test comes back positive from the lab.  I've been a FAITHFUL pain management patient for almost two years and it would crush me if my doctor didn't trust me.  I have never had this issue before so I don't know if it's possible to leave your system that fast!  I hope not.  If you have any experience to share I would be grateful.  Thanks so much.
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It will still be in your system on the 4th day just the levels start to fall off after day 3 but they don't disappear that quick.

I to am on the fentanyl patch but doctors in the uk don't test people like they do in the states.
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