Description

The Cape Town Index is a simple measure of activity in Crohn's disease, which can be used over time to monitor disease activity in a patient with Crohn's disease. It was developed at the University of Cape Town.


Parameters: 9 clinical and 1 laboratory:

(1) diarrhea

(2) abdominal pain

(3) well-being

(4) local complications

(5) systemic complications

(6) temperature

(7) body weight compared to last weight

(8) abdominal mass

(9) abdominal tenderness

(10) hemoglobin in g/dL

 

Parameter

Finding

Points

diarrhea

<= 4

1

 

5

2

 

>= 6

3

abdominal pain

none

0

 

mild

1

 

moderate

2

 

severe

3

well-being

normal

0

 

below par

1

 

unwell

2

 

terrible

3

local complications

none

0

 

skin tag

1

 

sinus

2

 

fistula

3

systemic complications

none

0

 

stomatitis

1

 

arthralgia

2

 

arthritis, iritis, erythema nodosum

3

temperature

<= 37°C

0

 

> 37 to <= 38°C

1

 

> 38 to <= 39°C

2

 

> 39°C

3

body weight compared to last weight

>= 95%

0

 

90 - 94%

2

 

< 90%

3

abdominal mass

none

0

 

indefinite

2

 

certain

3

abdominal tenderness

none

0

 

mild

1

 

moderate

2

 

severe

3

hemoglobin in g/dL

>= 12 g/dL

0

 

11 to < 12 g/dL

1

 

10 to < 11 g/dL

2

 

< 10 g/dL

3

 

where:

• The addition of the ESR (in mm during first hour, scored 3 points if > 40 mm, 2 points if > 25 and <= 40, 1 point if > 15 and <= 25, or 0 if <= 15) did not improve the correlation with the Crohn's Disease Activity Index (CDAI), described above.

 

Cape Town index =

= SUM(points for the 10 parameters)

 

Interpretation:

• minimum score: 1 (the footnote in Table I says the minimum score is 0, but 1 point is the minimum points for diarrhea as written. The probable situation is that 0 or 1 stool per day is not diarrhea and is scored 0. One point would be assigned for 2-4 stools per day.)

• maximum score: 30

• The higher the score, the more severe the Crohn's disease activity.


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