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. Plaquenil for hair loss treatment Plaquenil for lyme treatment 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. The test was repeated and the result was the same! I've been doing a lot of research to see what could cause a false positive, and have read that certain foods in large quantities almonds, mustard, broccoli, tomatoes, potatoes could yield a false positive. but I've consumed none of those in large amounts. Can anyone shed any light? 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. 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, False positive for cotinine" Smoking Cessation Community. Does hydroxychloroquine cause loss of taste in mouthSide effects of chloroquine phosphate tabletsAtp quantification assay chloroquine 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. Nicotine Testing – Complete Guide and Best Nicotine Tests.. What Can Cause a False Positive Drug Test - WebMD. How to Pass a Nicotine Urine Test 13 Steps with Pictures. Hi, As with all diagnostic tests, there will be false positives, i.e. tests that are positive while in reality they are negative. I suggest you have another test for nicotine. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Anders Mark Christensen, General. In the USA, drug testing for new employees, and during employment is pretty routine, in fact it's more unusual not to face some sort of drug testing. That has seen a rise in people wondering how to cheat a nicotine test, due to nicotine testing now becoming more frequent as why is nicotine testing becoming more frequent, and when could you face a nicotine drug test? Nicotine Test - Cotinine Test - Smoker's Nicotine Testing. Nicotine, which is the main drug in tobacco products, is the number one used drug in the U. S. Many people do not consider nicotine to be a drug, however it is. Nicotine is highly addictive and has the properties of both a stimulant and a sedative.