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CDAI Calculator for Rheumatoid Arthritis (Aletaha 2005)
x402
CDAI Calculator for Rheumatoid Arthritis (Aletaha 2005) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Computes the Clinical Disease Activity Index (CDAI) for rheumatoid arthritis by summing SJC28, TJC28, patient global assessment, and evaluator global assessment (no CRP required).
Price / call$0.005
Success—
StatusUnknown
How this service works
Aletaha 2005 Clinical Disease Activity Index (CDAI) for rheumatoid arthritis: SJC28 + TJC28 + patient global (0–10 cm) + evaluator global (0–10 cm). No CRP. Half points allowed; the sum is not integer-rounded. magent does not count joints. Arthritis Res Ther 2005 (ar1740) validates the sum and does not publish activity-state cutoffs. Not SDAI. Not Crohn's CDAI. Not a rheumatoid arthritis diagnosis.
Output
Returns a continuous numeric CDAI score (sum of SJC28 + TJC28 + PGA + EGA), which can include half-point values and is not integer-rounded. The score ranges from 0 to 76. No activity-state cutoffs are applied by this endpoint; interpretation of remission/low/moderate/high activity is left to the caller.
Example use cases
Rheumatology clinic visit documentation
“My RA patient at today's visit has 4 swollen joints, 7 tender joints, rates their global health at 5.5 out of 10, and I as the evaluator rate disease activity at 3.0. What's their CDAI score?”
Tracking RA treatment response over time
“Before starting the new biologic my patient had SJC28 of 12, TJC28 of 15, PGA of 8.0, and EGA of 7.5. Now they have SJC28 of 3, TJC28 of 4, PGA of 2.5, EGA of 2.0. Can you calculate both CDAI scores so I can compare?”
Clinical research data processing
“I have a spreadsheet row for a study participant: swollen joint count 28-joint = 2, tender joint count 28-joint = 5, patient global VAS = 4.0 cm, evaluator global VAS = 3.5 cm. Compute their Aletaha 2005 CDAI score.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/cdai_raWhen to prefer
Choose this endpoint when you need to compute the Aletaha 2005 CDAI for rheumatoid arthritis specifically — it is the only validated RA composite score that requires no laboratory values (no CRP or ESR). Prefer this over SDAI when lab results are unavailable or when using the CDAI-specific validation from Arthritis Res Ther 2005. Do not use for Crohn's disease activity (Harvey-Bradshaw/CDAI-IBD) or for diagnosing RA.
Side effects
- Missing required parameters (sjc28, tjc28, pga, ega) returns an error
- SJC28 or TJC28 outside integer range 0–28 may return a validation error
- PGA or EGA outside 0–10 range may return a validation error
- Non-integer values for sjc28 or tjc28 may be rejected
- Payment failure (x402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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