In drug testing, which term describes the step used to verify a positive screening result?

In drug testing, which term describes the step used to verify a positive screening result?

• A. Screening LTO
• B. Confirmatory LTO
• C. Drug certificate
• D. Mandatory drug testing

Answer: (B)

The main idea is that after an initial screening yields a positive result, a second, more specific test is used to verify that result. This confirmatory step employs highly selective analytical methods (such as GC-MS or LC-MS/MS) to definitively identify the drug and its amount, reducing the chance that a false positive from the screening method leads to an incorrect conclusion. Because of that precision, this step is the one that officially confirms a positive screening result before reporting it as a true positive. The other terms describe either the initial screening, administrative documentation, or policy, not the verification process.

The main idea is that after an initial screening yields a positive result, a second, more specific test is used to verify that result. This confirmatory step employs highly selective analytical methods (such as GC-MS or LC-MS/MS) to definitively identify the drug and its amount, reducing the chance that a false positive from the screening method leads to an incorrect conclusion. Because of that precision, this step is the one that officially confirms a positive screening result before reporting it as a true positive. The other terms describe either the initial screening, administrative documentation, or policy, not the verification process.