What are CDAI thresholds for disease activity?

CDAI remission ≤2.8; low disease activity 2.8-10; moderate 10-22; high >22; CDAI remission is slightly harder to achieve than DAS28 remission due to patient and physician global assessment inclusion.

Why is CDAI useful in clinical practice?

CDAI does not require blood tests, providing immediate at-point-of-care assessment; useful when CRP/ESR results are not available; tracks joint inflammation independent of systemic inflammatory markers.

How is patient global assessment measured?

Patient global assessment is a visual analog scale 0-10 cm or numeric rating scale 0-10; patient rates overall disease activity; physician global uses same scale based on clinical examination findings.

Can CDAI be used for biologic prescribing decisions?

CDAI is accepted by major RA guidelines for biologic initiation; NICE criteria accept DAS28 and CDAI equivalently; CDAI >10 (moderate activity) with inadequate cDMARD response justifies biologic therapy.

What is the difference between CDAI and SDAI?

SDAI adds CRP (mg/dL) to the CDAI formula; SDAI thresholds are remission ≤3.3, low ≤11, moderate ≤26, high >26; both avoid complex mathematical calculations unlike DAS28.

CDAI (Clinical Disease Activity Index) Calculator for Rheumatoid Arthritis

Calculates CDAI for rheumatoid arthritis using swollen and tender joint counts plus patient and physician global assessments, without requiring laboratory tests for rapid clinical assessment.

Use the full interactive calculator below, or

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CDAI (Clinical Disease Activity Index) Calculator for Rheumatoid Arthritis

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Frequently Asked Questions

What are CDAI thresholds for disease activity?

Why is CDAI useful in clinical practice?

How is patient global assessment measured?

Can CDAI be used for biologic prescribing decisions?

What is the difference between CDAI and SDAI?