Substance Abuse Test Kits will begin to react after contact with a sufficient amount of specimen and when the test is complete, the results will be interpreted according to the instructions for use. After the reaction in the test, one or two visible lines could be seen on the test strip.
With the help of these lines the drug concentration can be interpreted according to cut-off values. Cut-off values are used to interpret the difference between a positive test and a negative test. The cut-off value means the defined drug concentration.
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