CDAI (Crohn's Disease Activity Index)
Crohn's Disease Activity Index (Best 1976): liquid stools (×2) + abdominal pain (×5) + general well-being (×7) + complications (×20) + antidiarrheal use (30) + abdominal mass (×10) + hematocrit deficit (×6) + percent…
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Liquid/soft stools
- 20
- Abdominal pain
- 14
- General well-being
- 7
- Number of complications
- 1
- Antidiarrheal use
- Yes
- Abdominal mass
- 2
- Hematocrit
- 40 %
- Current weight
- 60 kg
- Standard/ideal body weight
- 70 kg
Result: CDAI 285: moderate disease (< 150 remission, 150-220 mild, 221-450 moderate, > 450 severe).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Bands
- < 150 remission, 150-220 mild, 221-450 moderate, > 450 severe (the mild/moderate split is a trial convention).
What you enter
- Liquid/soft stools (sum over 7 days)
- Abdominal pain (sum of daily 0-3 over 7 days)
- General well-being (sum of daily 0-4 over 7 days)
- Number of complications (0-6)
- Antidiarrheal use
- Abdominal mass (0 none, 2 questionable, 5 definite)
- Female (sets the hematocrit reference to 42)
- Hematocrit
- Current weight
- Standard/ideal body weight
How this is calculated
- Weights
- liquid stools x2, pain x5, well-being x7, complications x20, antidiarrheal x30, abdominal mass x10, hematocrit deficit x6, percent below standard weight x1.
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;70(3):439-444. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.