TABLE 7.

Sensitivities, specificities, PPV, and NPV of phenotypic methods for detection of ESBL production with molecular identification as the reference method for Enterobacter, Citrobacter, and Serratia sp. isolates (n = 28)

Detection method	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
MicroScan	0.0	NDa	ND	ND
Phoenix	90.0	33.3	42.9	85.7
VITEK 2	100.0	38.9	47.6	100.0
DAM	90.0	100.0	100.0	94.7
DDS	80.0	100.0	100.0	90.0
Etest ESBL	60.0	100.0	81.8	81.8

^aND, not determined.