What is the purpose of a chain-of-custody record in lead dust sampling?

• A. To track who has handled the sample from collection to analysis
• B. To determine the testing method
• C. To measure the sample's lead concentration
• D. To list the lab equipment used

Answer: (A)

The main purpose of a chain-of-custody record is to document the sample’s journey from collection to laboratory analysis, ensuring the sample’s identity and integrity are maintained. It records who handled the sample, when, where it was collected, how it was sealed and stored, and every transfer between people or facilities. This creates a verifiable, tamper-proof trail so the lab results can be trusted and defensible in audits or legal contexts. In lead dust sampling, keeping this traceable history is crucial because regulatory decisions depend on the accuracy of the results and any mix-up or contamination could lead to incorrect conclusions about exposure risk.

This isn’t about deciding how the testing is performed, measuring the lead concentration, or listing lab equipment. Those elements belong to the analysis process itself, while the chain-of-custody focuses on maintaining sample integrity and accountability throughout the handling chain.