TABLE 1.

Sensitivity and specificity of ESBL detection based upon disk diffusion zone diameter changes with addition of clavulanate^a

Test parameter	Value with criterion
	CTX zone diam change with CLA (mm) of:		CAZ zone diam change with CLA (mm) of:		FEP zone diam change with CLA (mm) of:
	≥3	≥5	≥3	≥5	≥3	≥5
% Sensitivity	66	66	88	55	88	77
% Specificity	96	100	82	91	91	100

^aCLA, clavulanate; CTX, cefotaxime; CAZ, ceftazidime; FEP, cefepime. Thirty-three tests were carried out.