Crohn's Disease Activity Index (CDAI)

Sum Factor Sub Total
A. Liquid stools
(cumulative total over the last 7 days)		 Number of liquid or soft stools over the last 7 days
   sum x 2  
B. Abdominal pain
(cumulative total over the last 7 days)		 Daily assesment
None = 0; Intermediate = 1 or 2; Severe = 3
   sum x 5  
C. General well being
(cumulative total over the last 7 days)		 Daily assesment
Well = 0; Intermediate = 1, 2 or 3; Terrible = 4
   sum x 7  
D. Extra-intestinal
(Select any or all symptoms you are having)		 Arthritis/arthralgia
Iritis/uveitis
Skin/mouth lesions
Peri-anal disease
Other fistula
Fever >37.8°C (in the last week) 		  score x 20  
E. Please tick if you are taking lomotil,
loperamide or opiates for diarrhoea		 (eg Lomotil)   value x 30  
F. Abdominal mass None (0) Questionable (2) Definite (5)   value x 10  
G. Enter your current Haematocrit (Hct).
Skip this section if your
current Haematocrit is unknown		 For male, (47 - Hct).
For female, (42 - Hct)		   value x 6  
H. Weight
(Maximum deduction of -10 for overweight patients)
Note: Skip this section if
Weight changes related to Crohn's are unknown.		 Current body weight kg
Standard body weight kg		 100 x (1 - (current/standard))  
  TOTAL CDAI SCORE  

The Crohn's Disease Activity Index or CDAI is frequently used to assess disease severity. It gives a score ranging from 0 to over 600, based on a diary of symptoms kept by the patient for 7 days, and other measurements such as the patient's weight and haematocrit.

A CDAI score of less than 150 is considered to be remission, a score greater than 220 is considered to define moderate to severe disease, and a score greater than 300 is considered to be severe disease. Most major research studies on medications in Crohn's disease define response as a fall of the CDAI of greater than 70 points.

Reference:

Best WR et al: NationalCooperative Crohn's Disease Study: Gastroenterology. 1976 Mar;70(3):439-44.

Disclaimer:
The calculators allow you to enter patient specific information to calculate a simple score. All information is provided for educational purposes only. This information is not intended to replace clinical judgement. All calculations must be rechecked and should not be used alone to guide patient care. The user assumes sole responsibility for any decisions or action taken based on the information contained here.