What does MIC stand for?

• A. Maximum Inhibitory Concentration
• B. Minimum Inhibitory Concentration
• C. Minimum Inoculum Concentration
• D. Microbial Inhibition Constant

Answer: (B)

MIC stands for the minimum inhibitory concentration—the smallest amount of an antimicrobial drug that will inhibit visible growth of a microorganism after a standard incubation. This quantitative measure is central to antimicrobial susceptibility testing because it shows how potent a drug is against a specific organism. In practice, labs test a range of drug concentrations and identify the lowest one that prevents growth, which helps clinicians decide if the drug is likely to be effective at achievable patient levels. The other options don’t fit: a maximum inhibitory concentration would describe the opposite end of the spectrum, minimum inoculum concentration refers to the amount of organism rather than the drug effect, and microbial inhibition constant isn’t used in standard susceptibility testing.