Non-invasive serological detection of Helicobacter pylori antigens in adult Hong Kong Chinese non-ulcer dyspepsia patients.
OBJECTIVE
The aim of our study was to evaluate the accuracy of the serology test kit (Signify H. pylori test), an office-based serological test and to compare relative performances with endoscopy, including biopsy urease tests (Clotest), histology, and culture when applied to dyspeptic adult patients in Hong Kong Chinese.


METHODS
Prospective clinical trial was conducted at the Alice Ho Miu ling Nethersole Hospital (AHNH) outpatient endoscopy center from June to December 2004 and included adult Chinese patients who attended the endoscopy center. A research nurse interviewed consenting patients and whole blood samples were obtained via simple fingerstick were then and transferred to Signify test kits. The results were read after 5 minutes. The presence of two distinct lines within the result-reading window was treated as a positive result; a single distinct line was treated as a negative result. All patients underwent upper gastroduodenal endoscopy, and antral/antrum gastric biopsy specimens were taken and then processed for microbiological cultures.


RESULTS
A total of 384 patients were recruited in the study and 131 (34.7%) patients were tested positive for H. pylori. Among them, 62 patients (47.3%) were detected by the Signify H. pylori test. The Signify serology test kit was 52.7% sensitive, 87.9% specific, and 75.7% accurate, respectively in the current study.


CONCLUSIONS
The Signify H. pylori test showed a sub-optimal correlation between the presence of H. pylori infection and the serological test results in a Hong Kong Chinese population.
Lee
Vivian W Y
VW
School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China. vivianlee@cuhk.edu.hk
Chan
Andrew K W
AK
Lee
Kenneth K C
KK
Chan
Francis K L
FK
D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial / Q000097:blood* / Q000276:immunology; D044466:Asian People; D004415:Dyspepsia / Q000097:blood* / Q000208:ethnology / Q000382:microbiology; D005260:Female; D016480:Helicobacter pylori / Q000276:immunology*; D006723:Hong Kong; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012698:Serologic Tests / Q000295:instrumentation / Q000379:methods
D000942:Antigens, Bacterial