I smoke 15 cig a day for 10 years I

Patient : I smoke 15 cig a day for 10 years... I have urine cotinine test for life insurance . I will have not smoked for 9 days prior to test...I'm 40, exercise regularly, and healthy and drink 100oz of water daily...will I pass the urine test?
Doctor :   Hello, Thank you for your query at AskTheDoctor.com Unfortunately cotinine have been found to be positive in smokers f or almost up to 2-3 weeks after stopping smoking. So, it is unlikely it won't be detected in your test. Some people clear it almost in a week, but traces have been found up to 2-3 weeks of last smoking activity. Feel free to discuss further.

Comments / Follow Ups

Patient: Cotinine is found in non smokers as well....Given the half life of about 24 hours of cotinine in a person, 9 days is about 9 half lives... all things being equal a starting point of 8000 ng/ml should be 16 ng/ml.....my question is can my cotinine level be under say 100 ng/ml in 9 days of no smoking? given what is known
Doctor: Yes, given what is known it would be below 100 ng/ml. Only traces can be found after 9 days of complete cessation of smoking.

Regards.
Patient: what is the passing lab standered level for life insurance companies for cotinine in urine?
Doctor: They accept anything below 5 ng/ml, however it varies between 5-10 across labs.

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