The diameter of this zone is then compared to standardized reference values to categorize the organism as susceptible, intermediate, or resistant. Quality Control and Troubleshooting Robust quality control is essential, involving the daily use of reference strains with known susceptibility profiles to verify reagent performance and technique.
Disk Diffusion Test Common Errors: Avoiding Pitfalls in Antibiotic Susceptibility Testing
Intermediate outcomes often signal the need for higher doses or additional testing, while resistant results indicate that standard therapy is unlikely to succeed. As the antibiotic migrates through the moist medium, it establishes a concentration gradient that decreases with distance from the source.
Technicians routinely test control disks alongside patient isolates to confirm that zone sizes fall within acceptable ranges. Laboratories rely on this relatively simple procedure to guide initial therapy decisions and to track resistance patterns within healthcare settings.
Common Errors in the Disk Diffusion Test: Troubleshooting and Quality Control
Each antibiotic-disk combination has published breakpoints that translate zone sizes into categorical results. When results appear unusual, factors such as improper inoculum density, excessive condensation, or expired disks are investigated.
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