Aspects of Validation
The most tested attributes in validation tasks may include, but are not limited to
- Selectivity/specificity
- Accuracy and precision
- Repeatability
- Reproducibility
- Limit of detection – especially for trace elements
- Limit of quantification
- Curve fitting and its range
- System suitability – In a broad way, it usually includes a test of ruggedness among inter-collaborators, or a test of robustness within an organization However, the U.S. Food and Drug Administration (FDA) has specifically defined it for its administration, as "System suitability testing is an integral part of many analytical procedures. The tests are based on the concept that the equipment, electronics, analytical operations and samples to be analyzed constitute an integral system that can be evaluated as such. System suitability test parameters to be established for a particular procedure depend on the type of procedure being validated". In some cases of analytical chemistry, a system suitability test could be rather a method specific than universal. Such examples are chromatographic analysis, which is usually media (column, paper or mobile solvent) sensitive However to the date of this writing, this kind of approaches are limited to some of pharmaceutical compendial methods, by which the detecting of impurities, or the quality of the intest analyzed are critical (i.e., live and death). This is probably largely due to
-
- their intensive labouring demands and time consumption
- their confinements by the definition of the term defined by different standards.
- To solve this kind of difficulties, some regulatory bodies or compendial methods usually provide the advices on what the circumstances or conditions that the performing of a specified system suitability test should be beared and compulsory.
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