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SDAI - Disease Activity Score in Rheumatoid Arthritis
The SDAI (Simplified Disease Activity Index) is a validated clinical score used to measure disease activity in rheumatoid arthritis, combining joint assessments and laboratory values.
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The SDAI (Simplified Disease Activity Index) is a validated clinical score used to measure disease activity in rheumatoid arthritis, combining joint assessments and laboratory values.
What is the SDAI?
The SDAI (Simplified Disease Activity Index) is a validated clinical measurement tool used to assess disease activity in rheumatoid arthritis (RA). It was developed to provide a quick and practical evaluation of disease progression in rheumatology practice. Unlike more complex scores such as the DAS28, the SDAI is straightforward to calculate as it requires no logarithmic formulas.
How is the SDAI Calculated?
The SDAI is composed of five parameters that are simply added together:
- Tender Joint Count (TJC28): Assessment of 28 defined joints for tenderness
- Swollen Joint Count (SJC28): Assessment of the same 28 joints for swelling
- Patient Global Assessment (PtGA): Scale from 0–10 cm (visual analogue scale)
- Evaluator Global Assessment (EGA): Scale from 0–10 cm
- C-reactive Protein (CRP): in mg/dL
The formula is: SDAI = TJC28 + SJC28 + PtGA + EGA + CRP
Interpretation of SDAI Scores
Disease activity is classified into four categories based on the total score:
- Remission: SDAI ≤ 3.3
- Low disease activity: SDAI > 3.3 to ≤ 11
- Moderate disease activity: SDAI > 11 to ≤ 26
- High disease activity: SDAI > 26
Clinical Relevance
The SDAI is used in rheumatology practice for monitoring disease progression and guiding treatment decisions. It allows clinicians to make therapy adjustments based on a combination of objective and subjective parameters. In particular, achieving remission (SDAI ≤ 3.3) is a central goal of modern treatment strategies such as the treat-to-target approach.
The SDAI correlates well with radiological joint damage and functional impairment, making it a reliable tool for evaluating treatment response in rheumatoid arthritis.
Advantages of the SDAI Over Other Scores
- Simple additive calculation without complex mathematical formulas
- Incorporates both objective (CRP) and subjective (patient assessment) parameters
- Well validated and internationally recognized
- Easily applicable in routine clinical practice
Comparison with the CDAI
The closely related CDAI (Clinical Disease Activity Index) omits the CRP value and consists only of the four clinical parameters. It can therefore be used when a current CRP value is not available. Both scores are recommended by EULAR (European Alliance of Associations for Rheumatology).
References
- Aletaha D, Smolen JS. The Simplified Disease Activity Index (SDAI) and Clinical Disease Activity Index (CDAI) - A review of their usefulness and validity in rheumatoid arthritis. Clinical and Experimental Rheumatology, 2005;23(5 Suppl 39):S100-8.
- Smolen JS, et al. EULAR recommendations for the management of rheumatoid arthritis with synthetic and biological disease-modifying antirheumatic drugs: 2022 update. Annals of the Rheumatic Diseases, 2023;82(1):3-18.
- Felson DT, et al. American College of Rheumatology/European League Against Rheumatism provisional definition of remission in rheumatoid arthritis for clinical trials. Arthritis & Rheumatism, 2011;63(3):573-586.
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