Microbiology Calculators & Interpretation

Antimicrobial disk diffusion breakpoints, inducible clindamycin resistance checker, and bench plating calculations.

Zone of Inhibition Interpreter (EUCAST)

EUCAST v16.1 (2026) Table Data

Target Organism

Antimicrobial Agent

Zone Diameter (mm)

InterpretationS ≥ 22 mm | R < 16 mm

Awaiting valid measurement...

MIC Breakpoints: S ≤ 2 mg/L | R > 8 mg/L

EUCAST Dosage Scheme: Standard: 1 g x 3 iv over 30 min | High: 2 g x 3 iv over 3 hours

D-Test (Inducible Clindamycin Resistance) Checker

Evaluates erythromycin antagonism causing blunting of the circular inhibition zone around adjacent clindamycin disks.

Erythromycin Disk

Clindamycin Disk

D-Zone Present

Reported Clindamycin Sensitivity:Susceptible

CFU/mL Plating Calculator

Colonies Counted

Format

Dilution Factor

Volume Plated (mL)

Recognised as 1:10 (10^-1)

Estimated CFU/mL: -

Oligo Resuspension Calculator

Lyophilised Oligo Amount (nmol)

Target Concentration (μM)

Diluent Volume to Add: 250.0 μL

Disclaimer: This toolkit is intended to support trained laboratory professionals. It provides calculation and decision-support functions and should be used in conjunction with local SOPs, validated laboratory procedures and current national guidelines. Final clinical interpretation remains the responsibility of the reporting laboratory.