Cotinine

Cotinine is a metabolite of nicotine produced when nicotine is broken down in your body. This test measures cotinine levels, which indicate tobacco or nicotine product use, including smoking, vaping, or exposure to secondhand smoke. Cotinine is detectable in blood, urine, and saliva for days to weeks after exposure. This test is used to assess tobacco exposure objectively, monitor smoking cessation efforts, and evaluate secondhand smoke exposure. It is valuable for clinical assessment, research, and occupational health screening.