CDAI (Crohn's Disease Activity Index)

stools
pts
pts
features
%
% of expected
Health

Calculate the CDAI score to assess Crohn's disease activity over 7 days.

Formula

CDAI = 2×stools + 5×pain + 7×wellbeing + 20×extraintestinal + 30×antidiarrheal + mass score + 6×(expected_Hct − Hct) + weight term
  • Expected Hct: 47% males, 42% females.
  • Score < 150: remission; ≥450: severe.
  • Best et al. Gastroenterology 1976;70:439.

Active Crohn's

Inputs
  • Liquid/Very Soft Stool Count (7-day sum): 14 stools
  • Abdominal Pain (7-day sum, 0–3/day): 14 pts
  • General Wellbeing (7-day sum, 0–4/day): 14 pts
  • Extra-intestinal Symptoms (number of): 1 features
  • Use of Antidiarrhoeal Drugs: 0
  • Abdominal Mass: 0
  • Haematocrit (%): 38 %
  • Body Weight vs Expected (%): 95 % of expected

Moderate disease activity (220–450).

Frequently asked questions

What CDAI defines remission?
CDAI < 150 is the traditional definition of clinical remission in Crohn's disease. Many trials use ≤150 as remission endpoint.