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Functional diagnostics

Ao. Univ. Prof. Dr. Johann Hammer

Senior physician

Ao. Univ. Prof. Dr. Walter Reinisch

Deputy Senior Scientist


Accessibilty: Checkpoint 7i, red bed building 

Tel.: +43 (0)1 40400-47320

Business hours: Monday to Tuesday 8:00 am –12:00 pm

Diagnostic workup of gastrointestinal dysfunction both on-site (7i/Room I) and analytical in the laboratory 6P.

  • H2 breath test: lactose H2 test, fructose H2 test, glucose H2 test
  • Irritable bowel: rectal sensitivity measurement: RSM
  • Colonic transit time: with pellets
  • Gastrointestinal permeability test: SLM test
  • Gastrointestinal absorption test: Xylose test
  • Intestinal inflammation: Fecal calprotectin
  • Antibodies in Crohn's disease: ASCA
  • DD Infection-CED: CD64 Expression
  • Azathioprine therapy (or 6-methylmercaptopurine): 6-thioguanine levels


  • Citrulline in plasma for malabsorption
  • Bile acids in stool for bile acid malabsorption 
  • Golimumab level in serum 
  • Vedolizumab level in serum