TABLE 2.

Comparison of the C. DIFF CHEK-60, C. DIFF CHEK-30, PCR for gluD, and bacterial culture to tissue culture assay

Test	Result	No. of samples with tissue culture assay resulta		Sensitivity (%)	Specificity (%)	PPV (%)b	NPV (%)c	Correlation (%)
		Positive	Negative
C. DIFF CHEK-60	Positive	127	93	92.7	89.1	57.7	98.7	89.6
	Negative	10	762
C. DIFF CHEK-30	Positive	129	89	94.2	89.6	59.2	99.0	90.2
	Negative	8	766
PCR for gluD	Positive	127	88	92.7	89.7	59.1	98.7	90.1
	Negative	10	767
Bacterial culture	Positive	87	81	63.5	90.5	51.8	93.9	86.8
	Negative	50	774

^aTissue culture assay for site 3 was performed at TechLab.

^bPositive predictive value.

^cNegative predictive value.