MIC Interpretation Tool
Enter a Minimum Inhibitory Concentration (MIC) value, select an organism and antibiotic, and get an instant Susceptible / Intermediate / Resistant classification based on EUCAST and CLSI breakpoints.
MIC Input
Common dilutions: 0.016, 0.03, 0.06, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64
Select organism, antibiotic, and enter a MIC value to see the interpretation
Organism
Antibiotic
MIC Entered
mg/L
S Breakpoint
mg/L
R Breakpoint
mg/L
Position on Scale
S
I
R
Guideline:
Breakpoints for Selected Combination
| Guideline | S ≤ (mg/L) | I (mg/L) | R ≥ (mg/L) |
|---|---|---|---|
| Select organism and antibiotic above | |||
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Summary
Enter a Minimum Inhibitory Concentration (MIC) value, select an organism and antibiotic, and get an instant Susceptible / Intermediate / Resistant classification based on EUCAST and CLSI breakpoints.
How it works
- Select the guideline: EUCAST (v14, 2024) or CLSI (M100 Ed34, 2024).
- Choose the organism and antibiotic from the lists.
- Enter the measured MIC value in mg/L.
- The tool compares it to the stored S and R breakpoints: MIC ≤ S breakpoint → Susceptible; MIC ≥ R breakpoint → Resistant; values in between → Intermediate.
- Review the displayed breakpoints to trace the result back to the published source.
Use cases
- Interpret MIC results from broth microdilution panels in clinical microbiology labs.
- Cross-check automated susceptibility system calls against published breakpoints.
- Teach antimicrobial susceptibility testing interpretation in microbiology courses.
- Verify appropriate antibiotic selection during antimicrobial stewardship reviews.
- Quick reference during ward rounds when pharmacy or lab data is not immediately available.
Frequently Asked Questions
Last updated: 2026-06-15 ·
Reviewed by Nham Vu