A lab drug test that is done with test strips provides a qualitative indication of the amount of specific drugs in urine; however, with the kind of lab drug testing that uses test strips and test cards it is not possible to determine the exact amount of drug that is present in any sample, it can only provide with preliminary results. A more specific method of laboratory drug test should be used in order to obtain a quantitative result in compliance with. SAMHSA and other regulatory agencies, most of such confirmatory testing are the gas chromatography / mass spectrometry (GC/MS) methods. These testing methods are widely approved and accepted as a confirmatory method for most drugs.

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