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magent DAS28-CRP Calculator (Wells 2009)
x402
magent DAS28-CRP Calculator (Wells 2009) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Computes the DAS28-CRP disease activity score for rheumatoid arthritis monitoring using the Wells 2009 formula with tender joint count, swollen joint count, CRP in mg/L, and patient global health VAS.
Price / call$0.005
Success—
StatusUnknown
How this service works
Wells 2009 DAS28(CRP): 0.56*sqrt(TJC28)+0.28*sqrt(SJC28)+0.014*GH+0.36*ln(CRP+1)+0.96. CRP is mg/L, not SDAI mg/dL. GH is 0-100 mm VAS, not 0-10. The +0.96 constant is required. Remission is DAS28<2.6 as stated in that paper. magent does not count joints or assay CRP. Not DAS28-ESR, SDAI, or CDAI. Not a rheumatoid arthritis diagnosis.
Output
Returns the computed DAS28-CRP composite score (a continuous number, typically 0–9+), calculated as 0.56*sqrt(TJC28)+0.28*sqrt(SJC28)+0.014*GH+0.36*ln(CRP+1)+0.96. The response indicates the numeric score and whether the patient meets the remission threshold (DAS28-CRP < 2.6 per Wells 2009). Does not return a diagnosis.
Example use cases
Rheumatology clinic visit documentation
“My RA patient today has 12 tender joints, 7 swollen joints, CRP came back at 22 mg/L, and she scored her general health at 68 out of 100 — what's her DAS28-CRP score and is she in remission?”
Monitoring treatment response over time
“Last month this patient had a DAS28-CRP of 4.1, and now her tender joints are 3, swollen joints are 2, CRP is 4.5 mg/L, and general health VAS is 30 — compute the new DAS28-CRP so I can see if the biologic is working.”
Research data pipeline scoring
“I have a cohort record: tjc28=6, sjc28=4, CRP 18 mg/L, patient global health 72 mm VAS — run the Wells 2009 DAS28-CRP formula and give me the score.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/das28_crpWhen to prefer
Use this endpoint when you need a programmatic, formula-exact Wells 2009 DAS28-CRP calculation (not DAS28-ESR, SDAI, or CDAI) and you already have all four inputs (TJC28, SJC28, CRP in mg/L, GH on 0–100 mm VAS) from a clinical source. Prefer this over manual calculation to avoid arithmetic errors and unit confusion. Do not use if you need ESR-based DAS28, if CRP is in mg/dL and cannot be converted, or if you need a diagnostic tool rather than a scoring tool.
Side effects
- Missing required query parameters (tjc28, sjc28, crp_mg_l, gh) returns a validation error
- Integer fields (tjc28, sjc28) provided as floats may be rejected
- CRP values outside the 0–500 mg/L clamped range may be clamped or rejected
- Using CRP in mg/dL instead of mg/L will silently produce an incorrect score — caller must convert units
- GH provided on 0–10 cm scale instead of 0–100 mm scale will silently produce an incorrect score
- Payment failure (x402) returns a 402 status requiring USDC payment before retrying
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
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