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Family Physician
Family Physician, Doctor (MD)
Category: Health
Satisfied Customers: 12619
Experience:  Emergency Medicine and Family Practice for over 26 years
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If i smoked weed 3 days in a row, 18 days ago will i pass a

Customer Question

If i smoked weed 3 days in a row, 18 days ago will i pass a urine drug screen test tomorrow? I hadn't smoked in 6 months except for those three days 18 days ago.
Submitted: 4 years ago.
Category: Health
Expert:  Vakul Aren replied 4 years ago.
DearCustomer
Hello.THC normally takes 14-30 days for elimination from the body.The fact that you smoked 3 days in a row does not make you a occassional user and you would probably fail the test.The excretion depends on the amount used,body weight and other parameters.
Customer: replied 4 years ago.
even if there was no smoking at all for 6 months prior? and none again for 18 days after?
Customer: replied 4 years ago.
even if there was no smoking at all for 6 months prior? and none again for 18 days after?
Expert:  Family Physician replied 4 years ago.

As a Medical Review Officer (MRO), trained and certified in drug testing interpretation - I would disagree with the other expert's opinion.


 


For truely occasional use such as you describe, the detection period is shorter. Depending on the sensitivity of the test (some employers use "zero tolerance" testing thresholds, the detection period is typically in the 3-5 days (7-10 on the high sensitivity testing)


http://www.aegislabs.com/ContentPage.aspx?WebPageId=19344&GroupId=-1

Customer: replied 4 years ago.
so just to be clear, with the conditions I described, there will be no detection since it has been 18 days since I smoked for three days in a row and 6 months prior to the those three days? The link you sent doesn't say how much or for how long the test are valid.
Expert:  Family Physician replied 4 years ago.
The link that I provided is from a laboratory that offers the "zero tolerance testing". It reports the period of detection - the time for which the test would be expected to be positive.

Here is another reference from Mayo Clinic
http://www.mayoclinicproceedings.com/content/83/1/66.full.pdf+html

Table 2 of this document includes the following detection periods;
Single use........3 days
Moderate use (4 times/wk)......5-7 days
Daily use.........10-15 days
Long-term heavy smoker..........greater than 30 days

Unfortunately, many sources on the web (particularly those promoting fraudulent products that claim to "clean" urine) report the 30+ day range. Then when some unsuspecting person purchases their completely useless product and passes the test they believe that the product actually did something useful.

Obviously, the accuracy of the information that you provided (number of days used, time since use and frequency) are key. If you are not being truthful with that information - then a longer detection period would possibly apply.

Edited by Family Physician on 7/18/2010 at 7:10 AM EST
Customer: replied 4 years ago.
that is the exact usage. Nothing for 6 months, then smoked for 3 days, then nothing for 18 after that. So judging by your info, I should pass. Right?
Expert:  Family Physician replied 4 years ago.
YES, based on the medical literature you would be expected to test negative on a urine test.

(I should mention that hair testing can be positive for 3-4 months)
Family Physician, Doctor (MD)
Category: Health
Satisfied Customers: 12619
Experience: Emergency Medicine and Family Practice for over 26 years
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