Which item is explicitly required as part of sample acceptance documentation?

• A. Weather conditions at the collection site
• B. Calibration records for the analytical instrument
• C. The number of samples collected per hour
• D. Date and time of laboratory receipt

Answer: (D)

Tracking the exact moment a sample is received by the lab is essential because acceptance documentation is about confirming the sample’s identity, integrity, and custody from collection to analysis. The date and time of receipt provide the timestamp that starts the hold-time clock, ensures the sample is logged correctly into the testing workflow, and supports traceability for audits or investigations. This timing also helps verify that any required preservatives or temperature controls were maintained during transport and that the sample remains within accepted conditions for the analyses planned. The other items don’t establish the formal record of arrival: weather at the collection site isn’t a standardized lab acceptance item, calibration records belong to instrument performance, and the number of samples collected per hour is an operational detail rather than part of the acceptance documentation.