Mueller Hinton Agar is used in antimicrobial susceptibility testing by the disk diffusion method. This formula conforms to National Committee for Clinical Laboratory Standards (NCCLS). Quality Control: Tested according to USB Standard Test Methods and NCCLS M6-A. Testing was performed in compliance with ISO/TS 11133-1 and BS EN 12322:1999 + A1:2001 standards. This product met or exceeded established NCCLS performance specifications.