Why are some samples identified with only a number when submitted to the laboratory for analysis?

Samples identified solely by a number when submitted for analysis helps ensure unbiased analyses by the technicians. This practice, often referred to as "blind" or "double-blind" sampling, prevents any potential bias that could arise if technicians were aware of the sample's source or other identifying information. It allows for objective evaluation and reduces the risk of any preconceived notions influencing the results.

In laboratory settings, maintaining the integrity of an analysis is crucial for ensuring valid outcomes. If technicians know the context of a sample (like its origin or the conditions under which it was collected), it could inadvertently lead to bias in how the sample is handled or evaluated. By using numeric identifiers, the laboratory focuses solely on the data generated by the analysis itself, promoting a more rigorous and trustworthy examination of the samples.

The other options, while they may seem beneficial in other contexts, do not align with the primary goal of unbiased analysis. Quick processing and maintaining consistency are important but aren't directly linked to the need for anonymity of the samples. Minimizing costs, while a consideration in many areas of laboratory operations, does not directly address the rationale behind using numerical identifiers.