Many factors can determine how long a particular substance is detected in a person’s urine sample these include their age, weight, sex, metabolic rate, the amount consumed, and over what time frame. Urine Cut-Off Levels Drug Nameĭetection times are estimates and apply only to urine screens. Source: National Institute on Drug Abuse (NIDA).
If a donor challenges the test result, a GC/MS confirmation from a certified laboratory will stand up in the court of law.Īll FDA-cleared drug screening test results always adhere to strict cut-off levels, as shown in the charts below. GC/MS confirmation is unequivocal when looking for drugs and quantifies the target metabolite with a number. Always use a SAMHSA-certified laboratory for testing. A laboratory will test your sample and confirm your suspicions with Gas Chromatography-Mass Spectrometry (GC-MS) This is the preferred method for testing and will quantitate the amount found reported in ng/mL. Whenever you get a presumed positive, it is impossible to know how much is in their system and if the rapid test worked correctly.
Should I use a laboratory if the drug cut-off levels show the result is positive?Ī laboratory should always be used to confirm a presumed positive urine sample.
is the result of an INVALID analysis, generally due to insufficient sample volume. Confirm your presumed sample utilizing a technique called Gas Chromatography-Mass Spectrometry at a SAMHSA-approved lab. Anything higher than these levels is presumed positive. This example applies to Cocaine and Opiates The metabolite of Cocaine was detected at a level higher than 300 ng/mL, and the metabolite for Opiates was over 2000 ng/mL. In Fig 2., this is a PRESUMED POSITIVE when no (T) line or bar is visible. In Fig 1., the image shows the results are NEGATIVE as all lines/bars are visible. The images above tell us the result of a drug screen under different scenarios. A presumed positive is when only one colored line is visible (C) with no apparent line in the (T) area.įig 3., the result is INVALID, generally due to insufficient sample volume. Each assay shows colored lines or bars in the images below, one in the (C) area and one in the (T) area. Results from an assay are displayed in panels on the face of the device. Note: If a Presumed positive is detected, an alternative method must be used to obtain a confirmed analytical result. Urine and Oral/Saliva screening provide only preliminary results. The recommended levels vary for each drug and can be seen in more detail in the tables below. For example, if cocaine was detected, the cut-off level will be at 300 ng/ml. A positive result is when a drug detected is above that set level for that drug. The cut-off level is a point at which a test is either a presumed positive or negative. These assays are used as a qualitative detection method and are overseen by the Food and Drug Administration (FDA). We offer high quality products, competitive prices and superior customer service.What are the Cut-Off levels? – Why do we use them?ĭrugs of Abuse Screening Tests are one-step lateral flow immunoassays intended for the detection of drugs in urine and oral fluids. Two-part drug test results forms includedįree Ground Shipping on Orders $75 or moreįor almost 20 years, we have been serving clients from all industries.
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