The sooner you quit, the better your chances on the test will be. Cotinine is a product formed after the chemical nicotine enters the body. Testing urine samples for cotinine is the most widely used method of detection. Average cotinine level for adult non-smokers in the US: 0.1 ng/mL. Blood Test. However, it may be detected in passive smokers for 15 to 20 days. Cotinine has an in vivo half-life of approximately 20 hours, and is typically detectable for several days (up to one week) after the use of tobacco. medtech254 : After you stop chewing blood levels of cotinine drop within 7 days, they can take more than two weeks to drop to the level of a non-tobacco user, while urine levels will take 2-3 weeks more. Also says level of cotinine is proportional to amount of exposure, so I'd think that if you work yourself down to a very low level of nic the week before (like 5-6 mg/ml), then switch to 0 maybe 3-4 days before the test, you'd probably be okay. It is unusual to see cotinine levels > 1 ng/mL in US non-smokers. Measuring cotinine in people’s blood is the most reliable way to determine exposure to nicotine for both smokers and nonsmokers exposed to environmental tobacco smoke (ETS). This is especially the case in chronic smokers. Even if you do that, cotinine levels might still show up as cotinine in urine or saliva. Learning how to pass a cotinine test in 24 hours is all about knowing which type of nicotine test you are facing. After smoking a cigarette, nicotine and its by-products stay in a person’s urine and saliva for 4 days and blood for up to 10 days. Might want to give it a full week just to be 100% sure. Nicotine is a chemical found in tobacco products, including cigarettes and chewing tobacco. Wikipedia says several days, up to one week. Note: There is always risk of secondhand exposure but exposure has steadily decreased in the US & Europe with greater regulatory oversight concerning smoke‐free indoor air quality. The amount of cotinine in your urine will vary depending on how frequently and how much you use nicotine. Quit using nicotine at least 3 days before the test. Levels of nicotine or cotinine may not be detectable after 3-4 days of stopping tobacco intake. I quit smoking and need to know How long Cotinine can be detected in a persons blood and urine. If you smoke regularly, it may take up to three weeks for the cotinine to clear your system. Regular smokers may have detectable levels for as long as 15 to 20 days. 3-4 days: at most. Nicotine is a short-acting drug, and is metabolized into cotinine, which can be detected in blood for 1-2 days, in urine 3-4 days at most. Cotinine levels in urine begin to return to normal about seven to 10 days after you last smoked, according to the University of Rochester Medical Center. The half life of cotinine is between 7 and 40 hours. On average, nicotine can be detected in urine for about three days. Cotinine, the chemical detected by the test, stays in your system for days. Unfortunately, you can’t use any nicotine products, including patches and other replacement therapies. Urine tests are done at home or in a lab, with results returned within 24 hours to five days. A US doctor answered Learn more. If it’s a blood test, then they are very rare. In case, menthol cigarettes are taken, cotinine may take a longer time to be excreted through wastes. Nicotine will be present your blood after about four days, although if you are a chronic smoker, cotinine can stay in your blood for up to 10 days…

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