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Antimicrobial susceptibility testing and blood cultures
1Clinical Microbiology Laboratory, Duke University Medical Center, Durham, North Carolina.
Clinics in Laboratory Medicine
|March 1, 1994
Summary
Direct antimicrobial susceptibility testing offers faster results for blood cultures. Standardized guidelines are needed to improve accuracy and reliability, though repeat testing may still be advisable.
Area of Science:
- Clinical microbiology
- Infectious diseases
- Antimicrobial resistance
Background:
- Blood culture susceptibility testing is crucial for guiding antimicrobial therapy.
- Current standardized methods, while reliable, can be time-consuming.
- Emerging resistance patterns necessitate rapid and accurate diagnostic tools.
Purpose of the Study:
- To evaluate the utility and standardization of direct antimicrobial susceptibility testing (AST) from blood cultures.
- To compare the accuracy and speed of direct AST with conventional methods.
- To identify areas for improvement in direct AST protocols.
Main Methods:
- Review of existing literature on direct and standardized AST techniques.
- Comparison of automated and non-automated direct AST methods (disk diffusion, agar dilution).
- Analysis of discrepancy rates between direct and standardized AST.
Main Results:
- Direct AST can yield results up to 24 hours sooner than conventional methods.
- Non-automated direct AST methods like disk diffusion and agar dilution show reliability.
- Limited data exists for automated direct AST, with inconclusive results but low discrepancy rates.
Conclusions:
- Direct AST is valuable for rapid results, but standardization is lacking.
- Further clinical evaluations with resistant organisms are needed to confirm accuracy.
- Laboratory directors must weigh the benefits of direct AST against current methods and consider repeat testing.