The presence of nicotine in blood can be a sign that the individual smokes. There are some blood tests that measure cotinine, a chemical produced from nicotine in the body, instead of nicotine. Hydroxychloroquine pill Doxycycline plaquenil lyme Jul 23, 2012 Reasons for false nicotine positives There can be a number of reasons why an individual can test positive for a nicotine blood test. Reasons range from diet to other medications to environment to human errors in labs. Some details about why your blood test may throw up a false positive are given below. A saliva test can determine nicotine levels of 0 to 2000ng/ml, the widest range offered by any of the three types of the test. Just like urine test, saliva test requires the individual’s saliva to be soaked in a strip, for about twenty minutes. Urine or saliva testing could also be used to test for nicotine. While some tests indicate levels of nicotine present in the bloodstream, other tests indicate either a positive or negative. There are several reasons why a blood test for nicotine can yield a false positive. Reasons for false nicotine positives There can be a number of reasons why an individual can test positive for a nicotine blood test. Some blood tests measure the level of nicotine or cotinine in the blood while some other tests give a positive or negative report according to some predetermined levels for these chemicals in blood. Can plaquenil cause a positive nicotine urine test Does Secondhand Smoke Show Up On Drug Test, Nicotine Testing – Complete Guide and Best Nicotine Tests. How long til hydroxychloroquine to workLichen planus plaquenilPfcrt chloroquine resistanceCuando dejat de tomar la hydroxychloroquine What Can Cause a False Positive Drug Test. “Investigation of interference by nonsteroidal anti-inflammatory drugs in urine tests for abused drugs,” “False positive urine drug screens. What Can Cause a False Positive Drug Test - WebMD. Reasons for False Positives for Nicotine on a Blood Test.. Medications That Can Cause a False Positive on Drug Tests.. People will go to drastic measures to prevent a positive drug test result when they are required to undergo a urine drug test. Urine dilution is one of the easiest ways to attempt to cheat a drug test, but this method of adulteration is risky and can be easily detected through the use of built-in adulteration strips. Doctors give trusted answers on uses, effects, side-effects, and cautions Dr. Liporace on can plaquenil show positive drug test Although Provigil is a stimulant of sorts, its chemical makeup is dissimilar to amphetamines and should not cause a false positive drug test. Cotinine urine test, nicotine urine test This test measures the amount of cotinine in your urine. Cotinine is a chemical your body makes after you are exposed to nicotine. You may have this test to measure your progress in a program to quit smoking.