Skip to main content Deutsch

Functional diagnostics

Ao. Univ. Prof. Dr. Johann Hammer

Senior physician

Ao. Univ. Prof. Dr. Walter Reinisch

Deputy Senior Scientist

Accessibility: Checkpoint 7i, red bed Building

Appointments Phone:  +43 (0)1 40400-47320

Business hours: Monday-Thursday 8:00 am - 12:00 pm by appoinment

Diagnostic clarification of gastrointestinal dysfunctions both on site (7i/Room I) and analytically in the laboratory 6P.

  • H2 breath tests: lactose H2 test, fructose H2 test, glucose H2 test
  • Irritable bowel: rectal sensitivity measurement: RSM
  • Colon transit time: with pellets
  • Gastrointestinal Permeability Test: SLM Test
  • Gastrointestinal absorption test: xylose test
  • Inflammation of the bowel: fecal calprotectin
  • Antibodies in Crohn's disease: ASCA
  • DD infection-IBD. CD64 expression
  • Azathioprine therapy (or 6-methylmercaptopurine): 6-thioguanine level


  • Citrulline in plasma for malabsorption
  • Fecal bile acids for bile acid malabsorption
  • Serum golimumab levels
  • Serum vedolizumab levels