The CLSI document M100 is the definitive resource for all standard susceptibility interpretative criteria.
Oxacillin is the standard antibiotic incorporated into MIC testing algorithms to predict resistance to beta-lactam antibiotics. Table 3 provides the breakpoints for oxacillin as defined by CLSI.
Table 3. Interpretative Criteria for Oxacillin and S. aureus.| Antibiotic | Susceptible | Intermediate | Resistant |
| Oxacillin | ≤2 µg/mL | – | ≥4 µg/mL |
