Urine Drug Testing, What To Know:
The urine test for weed is based on detection of 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid (9-carboxy-THC), a metabolite of delta-9-THC, which is the primary pharmacological active component of marijuana. Studies involving humans indicate that 80%-90% of the total dose of delta-9-THC is excreted within 5 days–approximately 20% in urine and 65% in feces.
Plasma concentrations of delta-9-THC peak by the time a smoked dose is completed and usually fall to approximately 2 ng/ml within 4-6 hours. 9-carboxy-THC is detectable in plasma within minutes after a dose is smoked and remains in plasma considerably longer than THC itself.
Urine from marijuana users contains quantities of 9-carboxy-THC in both free and conjugated form, as well as other cannabinoids (THC and its metabolites) detectable by the test.
It can take up to 90 days for the body to completely rid itself of any traces of marijuana if you are a heavy daily smoker. Most light smokers will pass in a few weeks with exercise and an increased water intake. Eating healthy foods low in fat is also key to pass a urine screen.
There are two main ways your urine could get tested for weed.
Screening Test For THC
The screening test is the most common and the least expensive way employers drug test. This test looks for up to 10 illicit drugs in your system including marijuana and provides fast results. These tests can be bought at most pharmacies and usually contain a dip strip that you test your urine with.
Gas Confirmatory Test For THC
This this test is very specific and is almost always used when testing for the presence of one specific drug. If a initial screening test shows positive for THC the confirmatory test might be requested. These tests are more uncommon when getting tested for weed for employment or random UA (urinary analysis). Learn more about marijuana detection times and types of tests here.
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Why you should never “trick the system” by cheating on a marijuana drug test:
- It is a felony crime in most states to be caught manipulating / cheating the results of a drug test.
- Most professional testing labs can and will detect the urine additives used in popular masking drinks and fake synthetic urine.
- It is becoming more and difficult to get away with using fake urine at many testing facilities, and you can forget about it in a supervised testing situation like a military or court ordered test.