Modifications of commercial toxigenic Clostridium difficile PCR resulting in improved economy and workflow efficiency

Area of Science:

• Clinical Microbiology
• Molecular Diagnostics
• Infectious Diseases

Background:

• Real-time PCR is a key molecular diagnostic tool for Clostridium difficile infection (CDI).
• High reagent costs can be a barrier to widespread adoption of molecular diagnostics in CDI detection.
• Optimizing laboratory workflows is crucial for cost-effective CDI testing.

Purpose of the Study:

• To evaluate the impact of modified laboratory protocols on the performance and cost-effectiveness of the BD GeneOhm Cdiff assay.
• To determine if frozen master mix and overnight aliquot preparation affect the accuracy of Clostridium difficile detection.
• To assess the potential for reducing reagent expenditure without compromising diagnostic performance.

Main Methods:

• The BD GeneOhm Cdiff assay was tested using two modified protocols: frozen master mix and overnight aliquot preparation.
• Performance indices (sensitivity, specificity, etc.) were compared against the standard package insert protocol.
• Statistical analysis (P-values) was used to determine the significance of performance differences.

Main Results:

• Modified protocols (frozen master mix, overnight aliquots) did not significantly impact the assay's performance indices compared to the standard protocol (P ≥ 0.31).
• The assay, even with modifications, provided accurate results for Clostridium difficile detection.
• Reagent expenditure was demonstrably decreased using the modified preparation methods.

Conclusions:

• Frozen master mix and overnight aliquot modifications are viable strategies for the BD GeneOhm Cdiff assay.
• These modifications maintain diagnostic accuracy for Clostridium difficile infection.
• Implementing these changes can lead to significant cost savings in molecular diagnostics for CDI.