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Wyandotte, MI
A 34-year-old female asked:

how long after quitting smoking will a blood test come back negative for nicotine?

2 doctor answers2 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Testing fluid: Usually urine and oral fluid are tested, rather than blood as the metabolite of nicotine is detectable in urine for a week after last exposure. Two weeks would be a safe time frame.
Dr. Robert Fietsam
Thoracic Surgery 35 years experience
Poss 7 days: In a light smoker, on NO nicotine replacement therapy (no GUM, or patches), the half live on Cotinine, is only 20 hours, so neg in about 5 days. It will be higher therefore, last longer in a heavy smoker.

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A member asked:

My daughter just came back from haiti..She has a 1" radius of redness with a black center? Is this a spider bite? She is having pain with it.

3 doctor answers3 doctors weighed in
Dr. Cornelia Franz
Specializes in Pediatrics
Could be : She needs to be seen and have that evaluated. Black center means a necrotic center and may need to be debrided. Make an appointment.

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Last updated Oct 2, 2019
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