Certain tests can be performed with your blood or urine to know if you are using drugs. One of those is the THC urine test which will search for tetrahydrocannabinol (THC) – a metabolite of marijuana. Plaquenil for lupus mechanism Plaquenil consumer medicine information That means that 1 in 10,000 people taking plaquenil hydroxychloroquine reported having a false positive result on a urine drug screen. If that happens to anyone w/ a Rx for it - I'll wager that it would be recognized as an error and no bad consequences would happen for the individual. Helpful, trusted answers from doctors Dr. Srivastava on what causes false positives in marijuana drug testing My guess is that the level of thc in the semen would probably be very small, if detectable at all. You might be more likely to test positive from inhaling second hand smoke when he smokes pot near you. Clearly you did not think to search google as I plugged your question in and got 22,000 hits on "Plaquenil causing false positives for THC". It must be reasonably common. I'm sorry that you were not pro-active in finding an easier way to find answer as the information is all there and has been "for many years". But sometimes, this test can give a false positive when you have never used marijuana. Since laboratory people are involved in the analysis process for THC in the urine, there is a chance of human error such as wrong labeling or external contamination. A positive result will indicate a recent use of this drug. Plaquenil false positive thc Hydroxychloroquine - I believe this drug causes false., What causes false positives in marijuana drug testing. Alcohol dehydrogenase chloroquineCan hydroxychloroquine be taken with humiraPlaquenil farmacia online But other medications have been implicated to potentiall cause false positives in rare cases for THC in urine testing. see this article. chronic use of ibuprofen and naproxen have been reported to cause false positives for cannaboid testing and barbituate urine testing. let me know if you have questions. I was told several years ago that plaquenil can cause a.. Ok I seriously am fed up. I keep researching and find nothing.. What causes false positive for THC in drug test?. HI Well come to HCM I really appreciate your concern, if the drug really being taken then no question of false positive is there and it will be detected even if it is taken in small amount hope this information helps. Q Can you explain the reason for a false-positive urine drug screen for marijuana? A In 2013, an estimated 19.8 million Americans aged 12 years or older were current past month users of marijuana and 8.1 million were daily users. 1 An analysis of 7.6 million urine drug screens performed in the U. S. workforce, indicated the positivity rate for marijuana was 1.7%. 2 A positive urine drug. Testing for marijuana most often consists of a urine test, according to the Centers for Disease Control and Prevention 1 2. While most people who do not use marijuana will test negatively for the substance, some medications can cause a false positive reading 4. It is wise to bring all medications along when you're being tested for marijuana.