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Table 4 The sensitivity and specificity rates of four phenotypic ESBL detection methods compared to the reference method of genotyping

From: Cefixime and cefixime-clavulanate for screening and confirmation of extended-spectrum beta-lactamases in Escherichia coli

   Sensitivity (%) Specificity (%)
ESBL screening test CPD or CTX or CAZ 89.8 61.8
CPD 88.7 63.6
CTX 90.1 62.1
CAZ 84.5 64.7
CFM 87.7 64.7
Double-disk synergy test CPD or CTX or CAZ 84.3 71.9
CPD 63.5 75.8
CTX 78.3 72
CAZ 64.2 71.9
CFM 75.4 75.8
Disk replacement test CPD or CTX or CAZ 85.5 64
CPD 63.1 70.8
CTX 80.5 65.2
CAZ 70. 70.4
CFM 73 70
Vitek 2 ESBL test   67.1 100