Which statement best describes what a Levey-Jennings plot displays?

Which statement best describes what a Levey-Jennings plot displays?

• A. Control results over time
• B. Distribution of patient ages
• C. Reagent lot numbers
• D. Calibration curves

Answer: (A)

A Levey-Jennings plot shows control results over time. It tracks the measured values of a control sample for a specific test across multiple runs, with a central line for the mean of those control results and upper and lower control limits (often set at mean ± 2 SD or ± 3 SD). This setup lets you see how the assay is performing: points drifting, trending, or crossing limits indicate potential bias, imprecision, or instrument/reagent issues, prompting investigation. It’s not about patient ages, reagent lot numbers, or calibration curves, which is why those options don’t fit.

A Levey-Jennings plot shows control results over time. It tracks the measured values of a control sample for a specific test across multiple runs, with a central line for the mean of those control results and upper and lower control limits (often set at mean ± 2 SD or ± 3 SD). This setup lets you see how the assay is performing: points drifting, trending, or crossing limits indicate potential bias, imprecision, or instrument/reagent issues, prompting investigation. It’s not about patient ages, reagent lot numbers, or calibration curves, which is why those options don’t fit.