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 remission early onset rheumatoid arthritis What is the use of chloroquine phosphate Plaquenil effect on heart 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. Dec 18, 2018 Both prescription and nonprescription medications contain ibuprofen, which often occurs in combinations with other drug such as in some cough and cold medications. In the past, ibuprofen proved to cause false-positive test results; however, the National Organization for the Reform of Marijuana Laws reports that this problem has been resolved 2. 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. 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 Things That Can Make You Fail A Drug Test, Medications That Will Test Positve for THC Healthfully Buy hydroxychloroquine ukEye plaquenil What Can Cause A False Positive For Marijuana THC? What Can Cause A False Positive For Marijuana THC? There has always been much disagreement between drug test manufacturers, companies providing drug tests and the public that must take drug tests as to the validity of false positive drug tests for Marijuana THC, which is an Amphetamine. What Can Cause A False Positive For Marijuana THC?. Ask the Expert False-Positive Screen for Marijuana. Does plaquenil hydroxychloroquine cause false positives.. 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. 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. We hear “false positive” as a defense from professional athletes all the time when it comes to drug screens—but unexpected results on drug tests really do happen. A urine drug screen tests for the presence of certain illegal drugs and prescription medications.