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What is the most precise drug test?

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Anonymous

13y ago
Updated: 8/20/2019

Gas chromatographs/mass spectrometry (GC/MS) is the most precise drug test. It's also the most expensive drug test and it's slow to do, so labs that have these machines also have another machine called an "immunoassay" tester. (The most popular ones are EMIT and ELIZA tests.) They put all the samples through the immunoassay machine. Any sample that comes back positive gets fed into the GC/MS for confirmation.

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Wiki User

13y ago

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