The copy for the confirmatory laboratory is for which samples?

The copy for the confirmatory laboratory is for which samples?

• A. All samples
• B. Positive samples
• C. Negative samples
• D. Unknown samples

Answer: (B)

In this workflow, confirmation testing is only triggered by a positive screening result. The confirmatory laboratory performs a more specific, usually orthogonal, test to verify the presence of the analyte and rule out false positives. Therefore, the copy that goes to the confirmatory laboratory is prepared for samples that had a positive initial screen. This ensures that resources are dedicated to cases that actually require definitive identification, while negative results stay at the screening stage and unknowns are handled through further investigation rather than automatic confirmation.

In this workflow, confirmation testing is only triggered by a positive screening result. The confirmatory laboratory performs a more specific, usually orthogonal, test to verify the presence of the analyte and rule out false positives. Therefore, the copy that goes to the confirmatory laboratory is prepared for samples that had a positive initial screen. This ensures that resources are dedicated to cases that actually require definitive identification, while negative results stay at the screening stage and unknowns are handled through further investigation rather than automatic confirmation.