Glossary

Non-negative

A screening result that is not "negative" — pending confirmation, not yet a "positive."

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A non-negative immunoassay screen indicates the sample requires confirmation testing. It is not yet a positive — the confirmation step at a certified laboratory and the MRO review determine the final verified result.

Related terms & pages

Glossary

Confirmation test

A second-stage analysis that confirms (or rejects) an initial non-negative screening result.

 Glossary

Medical Review Officer (MRO)

A licensed physician trained to interpret drug-test results and serve as the medical buffer between the laboratory and the employer.