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Urine Hair Blood / Oral Fluid Alcohol: 6–24 hours [7] Note: Alcohol tests may measure ethyl glucuronide, which can stay in urine for up to 80 hours: up to 90 days [8] 12 to 24 hours Amphetamines (except methamphetamine) 1 to 4 days [9] up to 90 days: 12 hours Methamphetamine: 5 days- up to a week [10] up to 90 days: 1 to 3 days [10] MDMA ...
[1] [9] Because the concentration of many substances in the urine varies throughout the day, some tests require timed urine collections, in which the patient collects all of their urine into a container for a given period of time (commonly 24 hours). A small amount of the specimen is then removed for testing.
The main metabolite excreted in the urine is 11-Nor-9-carboxy-THC, also known as THC-COOH. Most cannabis drug tests yield a positive result when the concentration of THC-COOH in urine exceeds 50 ng/mL. [10] Urine testing is an immunoassay based test on the principle of competitive binding. Drugs which may be present in the urine specimen ...
Ethyl glucuronide (EtG) is a metabolite of ethanol which is formed in the body by glucuronidation following exposure to ethanol, usually from drinking alcoholic beverages.It is used as a biomarker to test for ethanol use and to monitor alcohol abstinence in situations where drinking is prohibited, such as by the military, in alcohol treatment programs, in professional monitoring programs ...
[8] [22] The sample can be collected at any time of the day, [23] but the first urine of the morning is preferred because it is more concentrated. [24] To prevent contamination, a "midstream clean-catch" technique is recommended, in which the genital area is cleaned before urinating and the sample is collected partway through the urination. [ 22 ]
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