For method development studies, which analytical performance test should be done first?

For method development studies, which analytical performance test should be done first?

• A. Imprecision studies
• B. Comparison of methods (COM)
• C. Recovery
• D. Interference studies

Answer: (A)

Precision is the first thing to establish in method development because it defines how much the results vary when the test is repeated under the same conditions. By measuring the same sample multiple times in one run (within-run) and across different runs or days (between-run or intermediate precision), you quantify the assay’s variability with a coefficient of variation. This baseline of reliability is essential: if precision is poor, any later assessments of accuracy, recovery, or interference can be masked by random variation, making it hard to tell true bias or assay limitations. Once you know the method’s precision, you can interpret recovery and interference results and perform method comparisons with a meaningful benchmark. So, imprecision (precision) studies are the logical first step in analytical performance testing during method development.

Precision is the first thing to establish in method development because it defines how much the results vary when the test is repeated under the same conditions. By measuring the same sample multiple times in one run (within-run) and across different runs or days (between-run or intermediate precision), you quantify the assay’s variability with a coefficient of variation. This baseline of reliability is essential: if precision is poor, any later assessments of accuracy, recovery, or interference can be masked by random variation, making it hard to tell true bias or assay limitations. Once you know the method’s precision, you can interpret recovery and interference results and perform method comparisons with a meaningful benchmark. So, imprecision (precision) studies are the logical first step in analytical performance testing during method development.