A collection of reagents and other associated materials containing a range of antimicrobial agents e.g., (antibacterial/antibiotic, antifungal/antimycotic and/or antimycobacterial) that may be impregnated on individual testing discs, in a strip format or a microplate, intended to be used to determine the susceptibility profile of a specific pathogen (bacterium, fungus and/or Mycobacterium), in a clinical specimen and/or culture isolate.