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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Is It Possible To Have A Negative Urine Drug Screen?

How is it possible to have a negative urine drug screen ? I take Norco 10, 3 or 4 times a day. I just found out today, according to my last two test I m not taking them ?!! I never take less than 3 a day, how can it not show up on my test ? I drink lots of Dr. Pepper & water, any chance the specimen is too diluted ?
Fri, 24 Jul 2015
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Radiologist,  's  Response
Hi,
Thanks for writing in.

It is possible that the concentration of drug is less in urine and therefore undetectable. Please take recommendation from your doctor regarding the dose and timing of sample to be given for testing. Individual drug metabolism differs in every person and you might have a fast excretion of the drug and it is cleared from your system.

There is no strong association between pepper and false negative drug screen test. You might like to discuss in detail with your doctor and the testing authorities. Please do not worry.
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How Is It Possible To Have A Negative Urine Drug Screen?

Hi, Thanks for writing in. It is possible that the concentration of drug is less in urine and therefore undetectable. Please take recommendation from your doctor regarding the dose and timing of sample to be given for testing. Individual drug metabolism differs in every person and you might have a fast excretion of the drug and it is cleared from your system. There is no strong association between pepper and false negative drug screen test. You might like to discuss in detail with your doctor and the testing authorities. Please do not worry.