Taking venlafaxine can result in a false positive urine test for PCP. THC protonix (pantoprazole): Yes a false positive test can be obtained but only on the urine dipstick - with the quantitative test there is no false results. 1 / 11. A worry for anyone undergoing an illicit drug screen - whether it be a urine, hair, saliva or blood test - is the possibility of a false positive drug test. Here's how to distinguish between true and false positives before conducting workplace drug testing. However, the Total B12 test suffers from a number of important limitations: False positives. Therefore, this may represent a situation that triggers investigation of a drug’s potential to cause a false-positive. Neither the presence nor absence of a drug in this ; Quetiapine (Seroquel) is an atypical antidepressant drug … There are a number of over the counter supplements that will have hemp seed in them. Several antidepressants can cause false positives. In fact, previous data suggests 5 to 10 percent of all drug tests may result in false positives and 10 to 15 percent may yield false … Secondhand Marijuana Smoke. Send thanks to the doctor 90,000 U.S. doctors in 147 specialties are here to answer your questions or … Venlafaxine (Effexor XR) is a commonly prescribed serotonin-norepinephrine reuptake inhibitor (SNRI) antidepressant used for anxiety, depression, and menopausal hot flashes. Medications iStock. What Can Cause a False Positive Drug Test. Total B12 concentration is the current standard front-line clinical test for checking for vitamin B12 deficiency. The definition of a false positive drug test is when you fail a drug test and have not used the drug you tested positive for on that drug test. This hemp seed in high enough doses will show up as marijuana. Reported false-positive results are summarized in Table 1. This can lead to you failing a drug test and not getting the job. 12) Antidepressants. Hemp seed oil is also sometimes used to produce B12 supplements, also known as riboflavin. If you hang out often with someone who puffs on pot, your urine could have traces of … Whether confirmatory testing for false-positives is undertaken will depend on the employer. Yes - NyQuil will give you a false positive on your drug test for Opiats everytime. The next thing that may cause a false positive on a drug test is a vitamin B supplement. False positives can occur in a hair test, but when a positive shows up the sample must be confirmed with a GC/MS,gas chromatography/mass spectrometry. immunoassay tests. Total B12 concentrations of less than 148pmol/L (200pg/mL) are generally considered indicative of deficiency. Testing positive on a drug test is possible even when a donor has not used any drugs. https://www.foxnews.com/health/6-everyday-products-fail-drug-test The panels on instant immunoassays can be triggered upon detection of harmless substances such as coffee, poppy seeds and vitamins. This “False Positive” is caused by caused by hundreds of products that are wrongly identified as illegal drugs or other drugs of concern. Each drug comes off the GC at a certain time (retention time) and with a specific amount of ions ratio, that allows it to be separated and distinguished from similar substances.