Saturday, October 25, 2014

Sunday, August 02, 2009 tlnews59, Community Member, asks

Q: Why would a urine test show positive for Fentanyl when I've never taken it? I do take MS Contin.

I've been under contract with a Pain Management Doctor for approximately 12-14 years.  I'm currently taking MS Contin ER (extended release) 100mg X 2 every 8 hours along with MSIR 15mg X 2 every 4 hours as needed for breakthru pain.  These are the only pain meds I take, however the month prior to my urine test my Doctor switched me to an equal amount of Oxycontin, which I took for one month and decided it didn't work as well for me.  I do believe it had been a full 30 days since taking any Oxycontins that the urine sample was given. 


My Urine test has come back positive for Fentanyl, Codeine and one other drug I do not take.  I have never taken Fentanyl and its been a long, long time since I've taken Codeine.  I am on a few other medications for a variety of reasons;  High Blood Pressure, Depression, Indegestion, Anti-Inflamatory, Water Pills, Vitamins & occasionally Lunesta for sleep. My Doctor says if he kept me on as a patient he could lose his License.  However I'm also questioning that because I've heard thru the Grapevine that this is one of the ways my Doctor weeds out his Medicare patients, me being one of them. 


Could someone help me with my dilemma, has this ever happened to you?  Or can someone explain to me how I can test positive for a drug I've never taken?  Thanks in advance for your help.

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Answers (1)
Karen Lee Richards, Health Guide
8/ 3/09 8:03am

I've heard from a few people who have had either false positives or false negatives on their urine drug tests.  There are a number of things that can cause false positives for a variety of drugs.  Here is a link to a site that lists quite a few of them, although I didn't see any for fentanyl:


A couple of other possibilities are: 1) The drug screen was incorrectly administered or the specimen was tainted, switched or tampered with (accidently or intentionally) between collection and processing; or 2) The drug screen was misinterpreted and/or recorded incorrectly.


My best suggestion would be to ask the doctor to test your hair to prove you did not use fentanyl or codeine since hair testing can detect drugs used within approximately 90 days.  I don't know that Medicare would cover hair testing, so you might have to pay for it yourself. 


Good luck!


Beth, Community Member
9/20/09 3:00pm

The verry same thing has happend to me only i take Morphine Sulfate and Hydrocodone as well as other meds. like high Inderal we need someone to help us to find out what would cause false positive for fentanyl.

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By tlnews59, Community Member— Last Modified: 10/30/13, First Published: 08/02/09