In quantitative LC-MS/MS, what best defines dynamic range?

In quantitative LC-MS/MS, what best defines dynamic range?

• A. The temperature range the instrument can operate.
• B. The concentration range over which the method yields accurate, linear responses without re-calibration.
• C. The mass-to-charge range detected.
• D. The maximum number of samples per day.

Answer: (B)

Dynamic range in quantitative LC-MS/MS is the span of analyte concentrations over which the method gives an accurate, linear response for quantification without needing re-calibration. This matters because, within this range, the detector’s signal is proportional to concentration and the measurements align with the true amounts, ensuring reliable results. In practice, you establish a calibration curve that covers from the lower limit of quantification up to the upper limit of quantification, and within that span you can quantify unknown samples confidently. If a sample falls outside this range, you would typically dilute (if too concentrated) or re-run with a wider or different calibration range, which may involve re-calibration. The other options describe aspects like temperature operation, the mass-to-charge detection window, or throughput, which are separate performance characteristics and do not define dynamic range.

Dynamic range in quantitative LC-MS/MS is the span of analyte concentrations over which the method gives an accurate, linear response for quantification without needing re-calibration. This matters because, within this range, the detector’s signal is proportional to concentration and the measurements align with the true amounts, ensuring reliable results. In practice, you establish a calibration curve that covers from the lower limit of quantification up to the upper limit of quantification, and within that span you can quantify unknown samples confidently. If a sample falls outside this range, you would typically dilute (if too concentrated) or re-run with a wider or different calibration range, which may involve re-calibration. The other options describe aspects like temperature operation, the mass-to-charge detection window, or throughput, which are separate performance characteristics and do not define dynamic range.