
What Causes False Positive Result For Nicotine On Drug Test?

there are some things that cause a false positive
Detailed Answer:
Hello and thank you for your question.
There are some foods and environmental exposures that can cause a falsely positive test for cotinine/nicotine. The most common foods to do this are broccoli, cabbage, mustard, garlic, radishes, almonds and horseradish. Also sometimes vegetarians can have elevated levels of a substance called thiocyanate, which can be a source of a false positive on a blood test for nicotine.
In addition people who works with metals at their job or as a hobby may also have elevated levels of thiocyanate, which can cause a false positive.
In addition, there are also incorrect laboratory reports.
Your wife deserves a second test if she is not a smoker.
Regards,
Dr. Robinson

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