Crohn’s Disease Activity Index (CDAI)

Gender :
Male :
Female :
Joint Pain / Arthralgia :
Iritis / Uveitis :
Erythema Nodosum / Apthous Ulcers :
Anal Fissures or Abscesses :
Other Fistula :
Fever in Previous Week :
# Loose BMs in Last Week :
Abdominal Pain :
General Well Being :
Use of Lomotil or Opiates for Diarrhea :
Abdominal Mass :
Hematocrit :
Current Weight (KG) :
Height :

The Crohn’s Disease Activity Index (CDAI) is a research tool to determine the current severity of Crohn’s disease.

Formula :

Summation of factors and variables that are positive.

Explanation of Result :

CDAI < 150 is used as a marker of remission of Crohn’s

CDAI > 450 is a marker of severe disease

* Please verify all calculations prior to clinical use.


  • Best WR, Becktel JM, Singleton JW, Kern F Jr. Development of a Crohn’s disease activity index. National Cooperative Crohn’s Disease Study. Gastroenterology. 1976 Mar;70(3):439-44. PMID: 1248701.