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DAS28-ESR Calculator (Prevoo 1995)
x402
DAS28-ESR Calculator (Prevoo 1995) 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-ESR score for rheumatoid arthritis disease activity using the Prevoo 1995 formula from tender joint count, swollen joint count, ESR, and general health VAS.
Price / call$0.005
Success—
StatusUnknown
How this service works
Prevoo 1995 DAS28-ESR: 0.56*sqrt(tjc28) + 0.28*sqrt(sjc28) + 0.70*ln(esr_mm_h) + 0.014*gh (0-100 mm VAS, not 0-10 CDAI/SDAI). Caller-assigned 28-joint counts 0-28; ESR strictly >0 (typical 1-150). magent does not count joints or assay ESR. Score only; Prevoo 1995 does not publish later EULAR 2.6/3.2/5.1 cutoffs. Not SDAI, not CDAI, not DAS28-CRP. Not a rheumatoid arthritis diagnosis.
Output
Returns the numeric DAS28-ESR score computed as 0.56×√(tjc28) + 0.28×√(sjc28) + 0.70×ln(esr_mm_h) + 0.014×gh. This is a continuous numeric value reflecting rheumatoid arthritis disease activity per the Prevoo 1995 formula. Note: EULAR remission/low/moderate/high activity cutoffs (2.6/3.2/5.1) are not part of the Prevoo 1995 publication and are not returned by this endpoint.
Example use cases
Monitoring RA treatment response
“My RA patient has 5 tender joints, 3 swollen joints, an ESR of 30 mm/h, and rates their general health at 40 on the 0-100 VAS — can you compute their DAS28-ESR score so I can track whether the new biologic is working?”
Baseline disease activity at diagnosis
“I need a DAS28-ESR for a newly diagnosed rheumatoid arthritis patient: tender joint count 12, swollen joint count 9, ESR 78 mm/h, and patient global health VAS 72 out of 100.”
Pre-visit clinical summary calculation
“Before my rheumatology clinic tomorrow, calculate the DAS28-ESR for a patient whose nurse recorded 2 tender joints, 1 swollen joint, ESR of 15 mm/h, and a general health score of 20 on the 100mm scale.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/das28_esrWhen to prefer
Use this endpoint when you need the ESR-based DAS28 score specifically (Prevoo 1995 formula). Choose this over DAS28-CRP when the available inflammatory marker is erythrocyte sedimentation rate rather than C-reactive protein. Do not use if you need SDAI, CDAI, or DAS28-CRP; those use different formulas and inputs. This is purely a computation endpoint — the caller must supply pre-assessed clinical values (joint counts, ESR, patient global health VAS).
Side effects
- esr_mm_h ≤ 0 will cause an error since the formula requires a natural log of a strictly positive value
- tjc28 or sjc28 outside 0-28 integer range may be rejected or produce out-of-range scores
- gh outside 0-100 range may produce invalid scores
- Missing any of the four required query parameters returns an error
- Confusing gh units (0-10 cm CDAI/SDAI scale vs required 0-100 mm VAS) will silently produce incorrect scores
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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