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A member asked:

i have a surgery coming up they want me to quit smoking they're going to test my blood for nicotine when do i have to quit in order for nicotine to not show up?

2 doctor answers4 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Ten days or more: Cotinine, a metabolite of nicotine is the chemical assayed in blood or urine tests for tobacco use. It may be positive for ten days since last exposure in a heavy user. Now would be a good time to quit for good.
Dr. Gurmukh Singh
Pathology 49 years experience
Provided original answer
Wish you good health!
Feb 20, 2018
Dr. Heidi Fowler
Psychiatry 25 years experience
Quit now for health.: “When someone stops using tobacco and nicotine products, it can take more than two weeks for the blood level of cotinine to drop to the level that a non-tobacco user would have and several weeks more for the urine level to decrease to a very low concentration.” REF: http://labtestsonline.org/understanding/analytes/nicotine/tab/test/

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