title: Evaluation of the Ez-HBT Helicobacter blood test to establish Helicobacter pylori eradication.
abstract: BACKGROUND
  The urea blood test (Ez-HBT) has been shown to compare favourably with the urea breath test in the diagnosis of active Helicobacter pylori infection.
  
  
  OBJECTIVE
  To examine the performance characteristics of the Ez-HBT Helicobacter blood test in establishing success or failure of therapy in H. pylori-infected adults using the 13C urea breath test as the reference method.
  
  
  METHODS
  13C urea breath test and Ez-HBT Helicobacter blood test were performed 4-6 weeks after completion of treatment in H. pylori positive subjects. Basal urea breath samples were collected; basal Ez-HBT Helicobacter blood test samples were not. Ez-HBT Helicobacter blood test results were reported as positive, negative, or indeterminate.
  
  
  RESULTS
  Seventy patients generated 126 measurable sets of urea breath and blood tests. The H. pylori cure rate was 93%. The sensitivity, specificity, and accuracy of the Ez-HBT Helicobacter blood test were 100%, 97%, and 97%, respectively. Six of eight false positive and indeterminate Ez-HBT Helicobacter blood test results could be attributed to incomplete fasting or a 13C enriched diet. After correcting for the non-fasting state, the positive predictive value of the Ez-HBT Helicobacter blood test improved from 56% to 86%.
  
  
  CONCLUSIONS
  The performance characteristics of the Ez-HBT Helicobacter blood test are comparable with that of 13C-urea breath test in establishing H. pylori eradication after therapy. Errors related to incomplete fasting can be mitigated by collection of a basal blood sample.
authors.affiliation: Division of Gastroenterology, Syracuse VA Medical Center, Syracuse, NY 10128, USA. furqaan@hotmail.com
authors.forename: F
authors.initials: F
authors.lastname: Ahmed
authors.forename: U K
authors.initials: UK
authors.lastname: Murthy
authors.forename: W D
authors.initials: WD
authors.lastname: Chey
authors.forename: P P
authors.initials: PP
authors.lastname: Toskes
authors.forename: D A
authors.initials: DA
authors.lastname: Wagner
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001944:Breath Tests / Q000379:methods; D003951:Diagnostic Errors; D003955:Diagnostic Tests, Routine / Q000379:methods; D004359:Drug Therapy, Combination; D005260:Female; D016481:Helicobacter Infections / Q000175:diagnosis / Q000188:drug therapy*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006403:Hematologic Tests / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D014508:Urea
chemical_list: D000900:Anti-Bacterial Agents; D014508:Urea