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Calculator: Rheumatoid arthritis Clinical Disease Activity Index (CDAI) in adults


Calculator: Rheumatoid arthritis Clinical Disease Activity Index (CDAI) in adults

 
Input
 
PGA  
EGA  

 
Tender joint count (TJC)
   Shoulder
   Elbow
   Wrist

Right hand
  MCP 1-5
IP 1, PIP 2-5








   
 
 
 








  Knee
Shoulder  
Elbow  
Wrist  
Left hand
MCP 1-5
IP 1, PIP 2-5
 








 
 
 
 










Knee  
TJC          
    
Swollen joint count (SJC)
   Shoulder
   Elbow
   Wrist

Right hand
  MCP 1-5
IP 1, PIP 2-5








   
 
 
 








  Knee
Shoulder  
Elbow  
Wrist  
Left hand
MCP 1-5
IP 1, PIP 2-5
 








 
 
 
 










Knee  
SJC          

 
Result
 
Important: Inputs must be complete to perform calculation.

 
 
CDAI  
 
Decimal precision  

 

 

CDAI interpretation

 
CDAI ≤2.8: Remission
CDAI >2.8 and ≤10: Low disease activity
CDAI >10 and ≤22: Moderate disease activity
CDAI >22: High disease activity

 
 

 
Notes
  • In the hands, the joints that are evaluated include the 1st through 5th MCP, the IP of the thumb, and the 2nd through 5th PIP.
  • The PGA estimate represents the patient's self-assessment of disease activity on a 0 to 10 scale where 10 means maximal activity.
  • The EGA estimate represents the evaluator's assessment of disease activity on a 0 to 10 scale where 10 means maximal activity.
  • A CDAI reduction by 6.5 represents a moderate improvement.
  • PGA: Patient Global disease Activity; EGA: Evaluator Global disease Activity; TJC: tender joint count; SJC: swollen joint count; IP: interphalangeal joint; MCP: metacarpophalangeal joint; PIP: proximal interphalangeal joint.

 
Equations used
 
CDAI = SJC + TJC + PGA + EGA

 

 
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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Topic 13449 Version 12.0