TABLE 7.

Comparison of the performances of diagnostic tests for Helicobacter pylori detection in adult patients^a

Test	Sensitivity (%)		Specificity (%)		PPV (%)		NPV (%)
	A	B	A	B	A	B	A	B
Culture	98.4	100	100	100	100	100	97.7	100
Histology	96.8	95.6	97.7	100	98.4	100	95.5	96.4
Urease test (24 h)	90.2	88.6	100	100	100	100	87.5	91.5
PCR	96.7	93.2	100	96.2	100	95.3	95.5	94.3
UBT	100	93.3	100	98.1	100	97.7	100	94.6
Serology	98.4	95.6	88.4	92.6	92.4	91.5	97.4	96.2
Immunoblot		95.6		92.6		91.5		96.2
Stool antigen test		88.9		94.4		90.9		90.7

^aPPV, positive predictive value; NPV, negative predictive value; study A, 105 patients tested (516); study B, 99 patients tested (386).