RapiGEN Inc. products

Cotinine is an alkaloid chemical found in tobacco and is also the predominant metabolite of nicotine. Cotinine is used as a biomarker for smoking. Cotinine has approximate 20 hours of in vivo half-life so it can be detected in a few days (up to one week) after the use of tobacco. The level of cotinine in the blood, saliva and urine depends on amount of exposure to tobacco smoke, so it is a valuable indicator of tobacco smoke exposure, including secondary (passive) smoke.