Table 1.

Summary of individual testing modalities to detect toxigenic C. difficile^a

n	Test result summaryb					Discrepancy analysis		Final classificationc
	BD GeneOhm	Meridian illumigene	TechLab Tox A/B II	Wampole Quik Chek Complete				BD GeneOhm	Meridian illumigene	TechLab Tox A/B II	Wampole Quik Chek Complete
				GDH	Tox A/B	C. difficile Present	Toxigenic C. difficile Present				GDH	Tox A/B
109	−	−	−	−	−	Not performed	Not performed	TN	TN	TN	TN	TN
9	+	+	+	+	+	Not performed	Not performed	TP	TP	TP	TP	TP
7	+	+	−	+	−	Yes	Yes	TP	TP	FN	TP	FN
3	−	−	−	+	−	Yes	No	TN	TN	TN	TP	TN
3	−	+	−	−	−	No	No	TN	FP	TN	TN	TN
2	−	−	+	−	−	No	No	TN	TN	FP	TN	TN
2	+	+	+	+	−	Yes	Yes	TP	TP	TP	TP	FN
1	−	+	−	−	−	Yes	Yes	FN	TP	FN	FN	FN
1	+	+	−	+	+	Yes	Yes	TP	TP	FN	TP	TP
1	+	−	−	+	−	Yes	Yes	TP	FN	FN	TP	FN
1	−	+	+	−	−	No	No	TN	FP	FP	TN	TN

^an (number of specimens) = 139.

^b−, negative; +, positive.

^cTN, true negative; TP, true positive; FN, false negative; FP, false positive.