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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Can Drug Test Shows The Threshold Level Of Smoke?

Hi, I am worried about a drug test thats coming up this monday. Last time i smoked weed was about 5 weeks ago. I havent smoked since. Before that i used to smoke 5 times a week a bowl a night. Sometimes two. I took a drug test last week and the results were negative dilute and they requested me to go and take it again. Before the test i failed some home dip test and i was worried but the results came as negative dilute. I am 5 10 weigh 175 and have a job where i drop sweat every day. Do you think i will male it below the threshold level?? I need advice.
Mon, 5 Oct 2015
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Addiction Medicine Specialist,  's  Response
Cannot be 100% sure.
Several points:
1) as you know, with chronic daily heavy use, marijuana builds up in the tissues and can pop out unexpectedly months after use. Loss of fat might contribute to this. The majority would be negative though by 5 weeks.
2) home tests are a bit unreliable but one might want to retest.
3) Dilute only lowers the amount in the urine by the amount of dilution. This is 2-3 times less concentrated than average urine AT THE MOST, and probably 2x or less. So, if undetectable in dilute, then probably still undetectable in non-dilute a few days later (time lowers the amount more than the dilution effect would)
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Can Drug Test Shows The Threshold Level Of Smoke?

Cannot be 100% sure. Several points: 1) as you know, with chronic daily heavy use, marijuana builds up in the tissues and can pop out unexpectedly months after use. Loss of fat might contribute to this. The majority would be negative though by 5 weeks. 2) home tests are a bit unreliable but one might want to retest. 3) Dilute only lowers the amount in the urine by the amount of dilution. This is 2-3 times less concentrated than average urine AT THE MOST, and probably 2x or less. So, if undetectable in dilute, then probably still undetectable in non-dilute a few days later (time lowers the amount more than the dilution effect would)