The minimum time required for an instrument to obtain a result, calculated from the initial sampling of the specimen, is known as:

• A. Dwell Time
• B. Turnaround Time
• C. Analysis Time
• D. Preanalytic Time

Answer: (A)

Dwell time is the minimum time the instrument needs to complete a measurement after the sample is introduced, representing the fastest possible result from the start of sampling. It reflects the instrument’s inherent measurement cycle, independent of delays in collection, transport, or batching. Turnaround time includes everything from specimen collection to result reporting, so it’s longer and depends on workflow. Analysis time refers to the actual measurement duration within the instrument, but not the full time from sampling to result if there are upstream or downstream delays. Preanalytic time covers all steps before analysis begins. So the description given—that minimum time from initial sampling to obtain a result—best fits dwell time.