Which combination of information is required on a sample label to ensure proper identification?

• A. Date, Time, Location, Parameter and Sampler's name
• B. Date, Time, Location, Parameter
• C. Date and Time only
• D. Time, Location, Parameter and Sampler's name

Answer: (A)

Accurate sample identification hinges on complete labeling that ties together when and where the sample was taken, what it is for, and who collected it. The date and time establish the exact collection moment, which is crucial for tracking samples across runs or experiments. The location identifies the source site, preventing mix-ups when multiple sites are involved. The parameter tells you what is being measured or tested, so you know the purpose of the sample. The sampler’s name adds accountability and helps resolve questions about collection, handling, or custody.

Together, these five elements provide full traceability and proper identification. Without any one of them, there can be confusion or misattribution—such as not knowing who collected the sample, or when it was taken, or what test it is for. Hence, including Date, Time, Location, Parameter, and Sampler’s name is the best practice.