Dwell time in automated analysis refers to which concept?

• A. Time between initiation of a test and the completion of the analysis
• B. Number of tests an instrument can handle in a specified time
• C. Ability of an instrument to perform a defined workload in a specified time
• D. None of these

Answer: (A)

Dwell time measures the duration of a single test’s run on an automated analyzer, from the moment you initiate the test to when the analysis is completed and a result is produced. It’s the cycle time for one test, reflecting how long the instrument spends from start to finish on that assay. This is different from throughput, which describes how many tests can be completed in a given period (tests per hour) and from workload capability, which refers to the instrument’s ability to handle a defined amount of work within a time frame. For example, if a single test takes two minutes from start to result, that two-minute interval is the dwell time for that test. Shorter dwell times can speed overall turnaround, but must align with accuracy and quality control requirements.