What is the primary concern when collecting duplicate samples for laboratory results?

The primary concern when collecting duplicate samples for laboratory results is the identification by the laboratory. Proper identification is crucial because it ensures that the duplicate samples are correctly matched with their corresponding original samples throughout the analysis process. This helps maintain the integrity of the results and allows for accurate comparison between the original and duplicate samples, ultimately providing a reliable assessment of variability or consistency in the data. Accurate sample identification prevents mix-ups and ensures that any discrepancies observed in the results can be properly attributed to the differences in sampling or handling, rather than to errors in processing or recording.

While cost of analysis, timing of collection, and storage conditions are important factors in sample collection and processing, they do not directly address the concern of maintaining proper identification throughout the laboratory analysis.