All are tests used to assess the treatment response in helicobacter pylori infection, EXCEPT:
The urea breath test, the stool antigen test, and biopsy-based tests can all be used to assess the success of treatment Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 1221
Urea breath test, the
Stool antigen test
Biopsy-based tests
Serology