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Calculator: Rheumatoid arthritis Simplified Disease Activity Index (SDAI) in adults


Calculator: Rheumatoid arthritis Simplified Disease Activity Index (SDAI) in adults

 
Input
 
CRP  
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.

 
 
SDAI  
 
Decimal precision  

 

 

SDAI interpretation

 
SDAI ≤3.3: Remission
SDAI >3.3 and ≤11: Low disease activity
SDAI >11 and ≤26: Moderate disease activity
SDAI >26: 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.
  • An SDAI reduction by 7 represents a moderate improvement. A reduction by more than 17 represents a major improvement.
  • CRP: C-reactive protein; 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.
  • In this calculator, mcg is the abbreviation for micrograms.

 
Equations used
 
SDAI = SJC + TJC +PGA + EGA + CRP

 

 
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.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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Topic 13450 Version 14.0

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