Table 2. Sensitivity, specificity, predictive values and accuracy of RUT, PCR and ELISA test for detection of H. pylori infections.

Assay		Gold standard		Sensitivity	Specificity	Accuracy	PPV	NPV
		Positive	not detected
RUT	Positive	47	5	92.16%	90.74%	91.42 %	90.38%	92.45%
	Negative	4	49
PCR	Positive	45	3	88.24%	94.44%	91.42 %	93.75%	89.47%
	Negative	6	51
ELISA	Positive	46	21	90.20%	61.11%	72.23%	68.66%	86.84%
	Negative	5	33
	Total	51	54

Abbreviations: RUT, rapid urease test; PCR, polymerase chain reaction; ELISA, enzyme-linked immunosorbent assay.