Limit of Detection (LOD) Testing in Analytical Method Development

1) Purpose

The purpose of this SOP is to outline the procedure for conducting limit of detection (LOD) testing during the analytical method development process, determining the lowest concentration of an analyte that can be reliably detected.

2) Scope

This SOP applies to all personnel involved in LOD testing for analytical method development projects within the analytical development department.

3) Responsibilities

The purpose of this SOP is to define the roles and responsibilities of all personnel involved in LOD testing.

4) Procedure

1. Selection of Analytical Method:
   1. Select appropriate analytical method based on method requirements and regulatory guidelines.
   2. Verify method suitability and performance characteristics.
2. Preparation of Sample Series:
   1. Prepare a series of samples with decreasing concentrations of the analyte.
   2. Ensure accurate preparation and labeling of sample series.
3. Execution of LOD Testing:
   1. Analyze each sample in the series using the selected analytical method.
   2. Determine the concentration at which the analyte can be reliably detected (LOD).
4. Data Analysis and Reporting:
   1. Analyze LOD testing data to determine the LOD value based on statistical methods.
   2. Document LOD testing results and conclusions in an LOD testing report.
5. Review and Approval:
   1. Review the LOD testing report for accuracy, completeness, and compliance with protocol requirements.
   2. Obtain necessary approvals from stakeholders before finalizing