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Related Concept Videos

Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies01:28

Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies

Peptic ulcer disease (PUD) presents with diverse symptoms depending on the location and severity of the ulcer. Clinical manifestations of peptic ulcer include dull pain and a burning sensation in the mid-epigastric region.
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy01:16

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy

Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
Peptic Ulcer01:27

Peptic Ulcer

Peptic ulcers are erosive lesions of the gastric or duodenal lining, most commonly caused by Helicobacter pylori infection. This Gram-negative, helical bacterium has adapted to survive the stomach’s acidic environment by producing urease, which converts urea into ammonia and carbon dioxide. The ammonia neutralizes gastric acid in the bacterium’s immediate environment, allowing colonization of the gastric mucosa. H. pylori attaches to mucus-secreting epithelial cells, penetrates the mucus...
Peptic Ulcer Disease IV: Management01:26

Peptic Ulcer Disease IV: Management

Medical treatment strategies for peptic ulcers encompass various methods. The primary goal of treatment is to diminish gastric acidity and strengthen mucosal defense mechanisms.
The therapeutic approach involves ensuring adequate rest, implementing drug therapy, promoting smoking cessation, making dietary modifications, and emphasizing long-term follow-up care.
Pharmacological management
The prevailing therapy for peptic ulcers involves a combination of managing the patient's current medication...
Peptic Ulcer Disease II: Pathophysiology01:24

Peptic Ulcer Disease II: Pathophysiology

Peptic ulcer disease develops when protective mechanisms of the gastrointestinal mucosa are overwhelmed by harmful factors, leading to localized erosions in the stomach or proximal duodenum. The main causes are Helicobacter pylori infection and chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs).Helicobacter pylori–Induced InjuryBacterial Adaptation and Colonization:H. pylori is a spiral, Gram-negative bacterium adapted to the acidic stomach. and transmitted through oral-oral or...
Urine Studies II: Urine Culture and Sensitivity Test01:26

Urine Studies II: Urine Culture and Sensitivity Test

A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...

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Updated: Jun 12, 2026

Quantitative Polymerase Chain Reaction (qPCR)-Based Rapid Diagnosis of Helicobacter pylori Infection and Antibiotic Resistance
06:40

Quantitative Polymerase Chain Reaction (qPCR)-Based Rapid Diagnosis of Helicobacter pylori Infection and Antibiotic Resistance

Published on: July 28, 2023

Optimal Sampling Site for the Diagnosis of Helicobacter pylori Infection with the Rapid Urease Test: A Prospective

Yuri Kim1, Heonwoo Lee2, Ga Hee Kim3

  • 1Division of Gastroenterology, Department of Internal Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.

Gut and Liver
|June 10, 2026
PubMed
Summary
This summary is machine-generated.

The rapid urease test (RUT) for Helicobacter pylori detection is most accurate using biopsies from the greater curvatures of the gastric antrum and corpus. A two-site biopsy approach at these locations optimizes diagnostic performance.

Keywords:
EndoscopyImmunohistochemistryStomachUrease

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Area of Science:

  • Gastroenterology
  • Infectious Diseases
  • Diagnostic Accuracy

Background:

  • The rapid urease test (RUT) is a common, cost-effective method for detecting Helicobacter pylori (H. pylori).
  • Optimal gastric tissue acquisition sites for RUT accuracy remain under investigation.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of RUT at various gastric sites compared to immunohistochemical (IHC) staining.
  • To identify the best gastric tissue acquisition site for RUT in clinical practice.

Main Methods:

  • Prospective enrollment of 377 patients undergoing esophagogastroduodenoscopy.
  • Evaluation of RUT diagnostic performance using five gastric biopsy sites against IHC as the reference standard.
  • Analysis included sensitivity, specificity, predictive values, and Cohen's κ coefficient.

Main Results:

  • H. pylori was detected in 61.0% of patients by IHC.
  • Corpus-GC biopsy showed the highest single-site diagnostic performance (sensitivity 0.89, specificity 0.78, κ=0.65).
  • Combining antrum-GC and corpus-GC biopsies yielded the highest accuracy (0.86) and agreement (κ=0.70).

Conclusions:

  • RUT demonstrates highest diagnostic accuracy when samples are taken from the greater curvatures (GCs) of both the gastric antrum and corpus.
  • A two-site biopsy strategy at the antrum-GC and corpus-GC is recommended for optimal RUT diagnostic performance.