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. Hydroxychloroquine not working Chloroquine prophylaxis pregnancy Plaquenil dangers Plaquenil and benadryl Will plaquenil show as thc on a drug test Download Here Free HealthCareMagic App to Ask a Doctor All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. 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. My supervisor did a urine drug screen test on me on the spot and my urine tested positive for a small trace of thc. I haven't touched marijuana since I was 18-19 years old and I am now 44 years old. Is there ANY possible way that any of my prescribed medications may be throwing a false positive test for thc? 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 Plaquenil Oral Uses, Side Effects, Interactions, Pictures., What causes false positives in marijuana drug testing. Plaquenil for ovarian cancerLong term side effects of plaquenil for rheumatoid arthritis 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". Ok I seriously am fed up. I keep researching and find nothing.. What causes false positive for THC in drug test?. Will you have Drug screen false positive with Plaquenil - eHealthMe. Drug screen false positive is found among people who take Plaquenil, especially for people who are female, 50-59 old, also take medication Neurontin, and have Gastroesophageal reflux disease THCA-A is the non-psychoactive biosynthetic precursor of THC and the main cannabinoid in fresh cannabis plant material. When heated, e.g. during smoking or baking, THCA-A is decarboxylated yielding THC 14 Fig. 1. As relevant incorporation through the bloodstream could not be verified in previous investigations. 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.