General Principles of Analytical Method Validation

General Principles of Analytical Method Validation explain parameters ensuring accuracy precision and reliability of analytical methods.

Analytical method validation confirms that methods used for testing, identification, quantification, purity, or potency measurements are suitable for their intended use.

Accuracy: Closeness of results to the true or accepted value.
Precision: Repeatability and reproducibility of results.
- Repeatability (intra-day): Consistency under identical conditions.
- Intermediate Precision (inter-day): Variability across multiple days or analysts.
Specificity/Selectivity: Ability of method to measure analyte unequivocally without interference from other components.
Linearity: Ability to produce results directly proportional to analyte concentration within a defined range.
Range: Interval between upper and lower concentrations where method demonstrates suitable accuracy and precision.
Limit of Detection (LOD): Lowest concentration that can be reliably detected (not necessarily quantified).
Limit of Quantification (LOQ): Lowest concentration that can be accurately and precisely quantified.
Robustness: Ability to remain unaffected by small variations in method parameters.
Ruggedness: Degree of reproducibility under varied conditions (different analysts, instruments, laboratories).

Define method purpose and criteria clearly.
Develop detailed validation protocol outlining experiments for each parameter.
Conduct experiments and collect data systematically.
Analyze data statistically.
Document validation report clearly with all parameters, results, and conclusions.