Accuracy of Helicobacter pylori stool antigen for the detection of Helicobacter pylori infection in dyspeptic patients

Table 1 Endoscopic diagnosis of dyspeptic patients.

Endoscopic findings	n	Percent (%)
Antral gastritis	49	77.7
Peptic ulcer	3	4.8
Duodenal ulcer	5	7.9
Gastric cancer	1	1.6
Gastroduodenitis	3	4.8
Esophagitis	4	6.3
Pangastritis	1	1.6

Table 2 Observed number of test results of H pylori tests (HpSA, Histology, and CLO test).

HpSA1	Histology	CLO test	n
Negative	Negative	Negative	30
Positive	Positive	Positive	3
Positive	Positive	Positive	3
Negative	Positive	Positive	3
Negative	Negative	Positive	3
Positive	Negative	Negative	42
Positive	Positive	Negative	6
Negative	Positive	Negative	7

¹BBHpSA: H pylori stool antigen using a cut-off value of 0.160.

Table 3 Sensitivity and specificity of HpSA¹ with different cut-off values in dyspeptic patients with biopsy-proven H pylori status.

Cut-off values	Sensitivity (%)	Specificity (%)
0.156	100	36.8
0.158	83.3	36.8
0.274	66.7	78.9
0.282	50	78.9
0.319	50	84.2

¹HpSA : H pylori stool antigen.