Table 2.

Evaluation of Helicobacter pylori antibody.

Antibody titer (U/ml)	< 3 (negative-low)			3–9.9 (negative-high)		10–49.9 (positive-low)			≥ 50 (positive-high)
Patient number	612			137		74			45
Kyoto score	0	≥1				≤1		≥2	≤1		≥2
Urea breath test		(–)	(+)	(–)	(+)	(–)	(+)		(–)	(+)
H pylori diagnosis	(–)	(–)	(+)	(–)	(+)	(–)	(+)	(+)	(–)	(+)	(+)
Patient number	577	32	2	121	16	14	18	42	1	12	32
Rate of false diagnosis			0.3%		11.7%	18.9%			2.2%
based on antibody			(2/612)		(16/137)	(14/74)			(1/45)