Cut-off levels

One of the key concepts within drug testing is the application of a cut-off level. This is the decision point which segregates a test result as being either positive or negative.

The cut-off for a test is given as a defined drug concentration. For drug screening tests, a cut-off is chosen that will minimise the number of false positive results. It is important to note that a negative sample doesn’t mean that it is drug free; it might contain a drug at a concentration that is lower than the defined cut off.

Where a drug test is reported as screen positive or presumptive positive, this merely shows drug presence. It cannot show how much drug was taken or be correlated to any degree of impairment. As this is a screening tool, all presumptive positives require a confirmation test.

Cut-off level details for all of our tests are available to all Concateno customers. To find out a cut-off level related to the Concateno product you use, contact Concateno Customer Services at webenquiries@concateno.com or check the products page here.

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