What is a characteristic of external quality control?

A characteristic of external quality control is that it requires calibrated test weights and typically takes longer than internal quality control processes. External quality control involves sending samples to an outside laboratory or organization that utilizes standard procedures to ensure that testing methods produce accurate and reliable results. The use of calibrated test weights helps to establish consistent benchmarks for testing accuracy. This process often requires careful setup, adherence to protocols, and analysis of results, which can contribute to a longer duration compared to simpler internal checks that might be performed on-site.

The other options highlight aspects that do not align with the nature of external quality control. While some aspects have their importance, they do not characterize the external quality control process accurately. For instance, external quality control is not quick and simple due to the comprehensive nature of the testing procedures involved. Additionally, it does require samples to process, as external quality control is based on the analysis of these samples, and results are typically not generated immediately but instead follow a structured review and analysis period.