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. 2013 Apr 5;30(8):501–506. [Article in Spanish] doi: 10.1016/S0212-6567(02)79087-2

Estudio de la validez de la serología «rápida» para el diagnóstico de la infección por Helicobacter pylori

Study of the validity of «rapid» serology in diagnosing Helicobacter pylori infection

JP Gisbert 1,*, MA Vázquez 1, J Cantero 1, JM Pajares 1
PMCID: PMC7679667  PMID: 12427373

Abstract

Objective

To evaluate prospectively the validity of a «rapid» serology diagnosis method (using capillary blood) in our ambit, taking for reference a combination of standard diagnostic methods.

Design

Prospective. The endoscopist, pathologist and those responsible for interpreting the rapid urease test, the breath test and «rapid» serology did not know the results of the other diagnostic methods.

Setting

Gastro-enterology service of a tertiary hospital.

Participants

30 consecutive patients with symptoms attributable to the upper digestive tract and who underwent an oral gastroscopy.

Main measurements

Gastric biopsies for histology examination and for the rapid urease test and a breath test with 13C-urea were conducted. For «rapid» serology, the commercial SureStep™ HP WB test kit was used. A patient was considered infected when at least two of the three validated techniques (rapid urease test, histology, breath test) were positive; and not infected, when all three were negative.

Results

30 patients, 30% male, with a mean age of 51, were included. The reference standard indicated 61% prevalence of infection, with two cases classed as undetermined. «Rapid» serology was positive in 8 patients and negative in 22. Sensitivity, specificity, positive predictive value and negative predictive value were, respectively, 41% (95% CI, 18–65), 91% (74–100), 87% (65–100) and 50% (28–72). The positive probability quotient was 4.5; and the negative, 0.65.

Conclusion

The «rapid» serology used in the current study has deficient diagnostic accuracy. Therefore, it should not be used in clinical practice to identify H. pylori infection.

Key words: Diagnosis, Helicobacter pylori, Breath test, Serology

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