title: Evaluation of clinical and home performance of the 13C-urea breath test for the detection of Helicobacter pylori.
abstract: OBJECTIVE
  This study analyses the 13C-urea breath test with the aim of determining the optimal time interval between dosing and breath sampling and examines the feasibility of having patients perform the test without supervision at home.
  
  
  METHODS
  Prospective study comparing the 13C-urea breath test with four antral biopsy-based tests in a random population undergoing upper gastrointestinal endoscopy.
  
  
  METHODS
  One university hospital and one general hospital.
  
  
  METHODS
  One hundred and four patients were included; 61 were Helicobacter pylori-positive and 43 H. pylori-negative according to biopsy-based tests.
  
  
  METHODS
  The 13C-urea breath test was performed at home by collecting a baseline and two post-dosing samples; the next day it was performed clinically by collecting a baseline and six post-dosing samples. A 100 mg dose of 13C-urea and a test meal were used.
  
  
  METHODS
  The breath samples collected were analysed. Excess delta 13CO2/12CO2 values above five per million were considered positive.
  
  
  RESULTS
  The specificity of the clinical test was 100% whereas that of the home-based test was 95.1%. The sensitivity of the clinical test depended on the time interval between dosing and collection of the evaluated sample. Sensitivity was 100% if the sample was taken 50 min or more after dosing. The home-based test had a sensitivity of 94.8%.
  
  
  CONCLUSIONS
  To obtain maximum sensitivity (100%) using the single-sample technique the sample has to be collected at least 50 min after dosing. It is feasible to have the test performed at home. Patient selection and thorough instruction are necessary.
authors.affiliation: Department of Gastroenterology, University Hospital, Groningen, Netherlands.
authors.forename: W J
authors.initials: WJ
authors.lastname: Thijs
authors.forename: J C
authors.initials: JC
authors.lastname: Thijs
authors.forename: J H
authors.initials: JH
authors.lastname: Kleibeuker
authors.forename: H
authors.initials: H
authors.lastname: Elzinga
authors.forename: F
authors.initials: F
authors.lastname: Stellaard
mesh_terms: D001706:Biopsy; D001944:Breath Tests / Q000379:methods; D002247:Carbon Isotopes; D005069:Evaluation Studies as Topic; D005240:Feasibility Studies; D005260:Female; D005753:Gastric Mucosa / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000175:diagnosis*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D011237:Predictive Value of Tests; D011446:Prospective Studies; D011933:Reagent Kits, Diagnostic; D012648:Self Care; D012680:Sensitivity and Specificity; D013997:Time Factors; D014508:Urea
chemical_list: D002247:Carbon Isotopes; D011933:Reagent Kits, Diagnostic; D014508:Urea