ToolsCalculators
Crohn's Disease Activity Index (CDAI)
Quantifies current severity of Crohn's disease from an 8-item weighted composite.
Crohn's Disease Activity Index (CDAI)
Liquid/soft stools, sum over 7 days
stools/wk
Abdominal pain rating, sum over 7 days (0=none to 3=severe each day)
points
General well-being rating, sum over 7 days (0=well to 4=terrible each day)
points
Number of listed complication categories present (of 6: arthritis/arthralgia; iritis/uveitis; erythema nodosum/pyoderma gangrenosum/aphthous stomatitis; anal fissure/fistula/abscess; other fistula; fever >37.8C this week)
categories
Taking an antidiarrheal/opiate for diarrhea
Abdominal mass
Sex
Hematocrit
%
Current body weight
Standard (ideal) body weight
Complete the fields above to see the result.
When to use
- Grading disease activity in Crohn's disease and tracking response to therapy, typically also used as an entry/response criterion in clinical trials.
Formula
CDAI = 2x(liquid/soft stools, 7-day sum) + 5x(abdominal pain, 7-day sum) + 7x(general well-being, 7-day sum) + 20x(number of complication categories) + 30x(antidiarrheal use, 0/1) + 10x(abdominal mass: 0/2/5) + 6x(47-Hct for men or 42-Hct for women) + 1x(% below standard weight).
Pearls and pitfalls
- CDAI <150 = remission, 150-219 = mild, 220-450 = moderate-severe, >450 = severe.
- Requires a 7-day symptom diary; not practical as a single-visit bedside tool.