Crohn's Disease Activity Index (CDAI)
The 7-day diary-based Crohn disease activity index used in trials.
Inputs
2 of 10SexUsed by the equation
Actual (total) body weight
stools
points
points
Arthritis or arthralgia; iritis or uveitis; skin or mouth lesions; perianal disease; other fistula; fever above 37.8 °C.
of 6
Taking antidiarrheal (opiate) medicine
Abdominal mass
%
Patient values are shared with every calculator.
When to use
- Trial-grade Crohn disease activity assessment.
Pearls and pitfalls
- Below 150 remission; 150–219 mild; 220–450 moderate; above 450 severe.
- A 70- or 100-point drop defines response in most trials.
- Standard weight is approximated with ideal body weight here.
Why use
The reference index for Crohn trials.
2 × stools + 5 × pain + 7 × well-being + 20 × complications + 30 × antidiarrheal + 10 × mass + 6 × (Hct deficit) + (% below standard weight)