Precision is one of the most important quality characteristics of an analytical method. It is a measure of how reproducible the results of the method are.
Precision is important in method validation because it ensures that the method is producing consistent results. This is essential for ensuring the accuracy and reliability of the analytical data.
Precision determines if I can reproduce the result with consistency within intra or inter day.
Precision is measured by injecting a series of standards or analysing series of samples from multiple samplings from a homogeneous lot. The sample can be from Accuracy sample or if there are enough impurities within drug product or drug substance, The % RSD of impurities also varies from impurity level.
The precision test is typically performed at three levels: repeatability, intermediate precision, and reproducibility.
Repeatability: This is the precision of the method within a single laboratory. It is measured by making multiple measurements of the same sample on the same day using the same equipment and analyst.
Intermediate precision: This is the precision of the method between different days and analysts within the same laboratory. It is measured by making multiple measurements of the same sample on different days using different analysts and equipment.
Reproducibility: This is the precision of the method between different laboratories. It is measured by making multiple measurements of the same sample in different laboratories using different equipment and analysts.
Importances of Precision
Assessment of Reproducibility:
Precision helps determine how consistently the method can generate the same results when applied multiple times by different analysts, using different instruments, or on different days. This is essential to ensure that the method's performance is reliable and not heavily influenced by variations in experimental conditions.
Detection of Systematic Errors:
Precision evaluation can reveal systematic errors or biases in the method, such as inaccuracies in sample preparation, instrument calibration, or data analysis. If the precision is significantly different between different analysts or instruments, it may indicate the need for adjustments or corrections.
Control of Variability:
In manufacturing and quality control settings, precision is critical for monitoring and controlling the variability of product attributes. Ensuring consistent and precise measurements can help maintain product quality and consistency over time.
Conclusion
Precision in analytical method validation serves the purpose of ensuring reliable and consistent measurement results, detecting errors or biases, and providing a basis for decision-making and regulatory compliance.
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