In drug identification, what is the purpose of screening tests?

In drug identification, what is the purpose of screening tests?

• A. To provide definitive identification of the substance.
• B. To perform nonspecific, preliminary testing to indicate possible substances.
• C. To quantify precise amounts in a sample.
• D. To visualize the chemical structure.

Answer: (B)

Screening tests in drug identification are designed to be nonspecific and rapid, providing preliminary indicators of what substances might be present. They help triage a sample by flagging potential drugs so that confirmatory testing with highly specific methods can verify the exact identity. Because they are not definitive and can react with multiple substances, they may yield false positives and do not determine precise quantities or reveal molecular structure. The role of screening is to guide the next steps, not to provide the final identification, which is established through confirmatory analyses such as GC-MS or LC-MS.

Screening tests in drug identification are designed to be nonspecific and rapid, providing preliminary indicators of what substances might be present. They help triage a sample by flagging potential drugs so that confirmatory testing with highly specific methods can verify the exact identity. Because they are not definitive and can react with multiple substances, they may yield false positives and do not determine precise quantities or reveal molecular structure. The role of screening is to guide the next steps, not to provide the final identification, which is established through confirmatory analyses such as GC-MS or LC-MS.