Effect of the 2014 Clinical and Laboratory Standards Institute urine-specific breakpoints on cefazolin susceptibility rates at a community teaching hospital

Table 1 Comparison of susceptibility breakpoints for cefazolin

Cefazolin	Susceptible (mcg/mL)	Intermediate (mcg/mL)	Resistant (mcg/mL)
CLSI guidelines: revisions to serum breakpoints
Pre-2010	≤8	16	≥32
2010–2014	≤1	2	≥4
CLSI guidelines: addition of urine-specific breakpoint
2014	≤16	–	≥32

ISSN: 1476-0711