Abstract
Several multilaboratory studies to determine quality control (QC) ranges for a variety of National Committee for Clinical Laboratory Standards (NCCLS) susceptibility tests are summarized. Replicate testing used multiple lots of media and antimicrobial disks in accordance with NCCLS recommendations, including the appropriate medium modifications for tests with Haemophilus spp. and Neisseria gonorrhoeae. QC ranges for MIC and disk diffusion testing of N. gonorrhoeae ATCC 49226 were proposed for cefepime, cefetamet, cefmetazole, and cefpodoxime. Disk diffusion QC ranges for Haemophilus influenzae ATCC 49247 or ATCC 49766 were recommended with cefepime, cefetamet (10- and 30-microgram disks), cefmetazole, cefpodoxime, and cefprozil. Disk diffusion QC ranges for Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 25922 with cefdinir and clinafloxacin and those for Pseudomonas aeruginosa ATCC 27853 with clinafloxacin were also proposed.
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