Stool antigen tests in the diagnosis of Helicobacter pylori infection before and after eradication therapy

Table 1 Performance of the three stool antigen tests as compared with UBT and serology in 282 subjects at baseline

UBT, serology	HpSA		HpStAR	ImmunoCard
Positive 185	Positive	1701	178	172
	Negative	131	7	13
	2 gray zone2
Negative 97	Negative	93	93	86
	Positive	43	4	11

¹One subject originally had gray zone result.

²Gray zone result even in re-examination.

³Three subjects originally had gray zone results.