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ASAS 2011 Peripheral SpA Classification Calculator
x402
ASAS 2011 Peripheral SpA Classification Calculator 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).
Applies the ASAS 2011 peripheral spondyloarthritis classification criteria (Rudwaleit set 2D / fig 1 + table 5) to determine if a patient meets classification thresholds via Arm A or Arm B.
Price / call$0.005
Success—
StatusUnknown
How this service works
ASAS 2011 peripheral SpA classification (Rudwaleit set 2D / fig 1 + table 5). Required: current arthritis, enthesitis, or dactylitis. Arm A: ≥1 of psoriasis, IBD, preceding infection, HLA-B27, uveitis, sacroiliitis on imaging. Arm B: ≥2 of arthritis, enthesitis, dactylitis, IBP in the past, family history of SpA. Not a diagnosis. Not ASAS 2009 axial. Not ESSG/Amor. magent does not examine joints or assay HLA-B27.
Output
Returns whether the patient meets ASAS 2011 peripheral SpA classification criteria, indicating which arm (A or B) was satisfied, whether the mandatory entry criterion (current arthritis, enthesitis, or dactylitis) was met, and the specific features contributing to the classification. Not a clinical diagnosis.
Example use cases
Rheumatology clinic SpA workup
“I have a patient with current asymmetric arthritis of the lower limbs and dactylitis. He's HLA-B27 positive and had a preceding GI infection. No psoriasis, no IBD, no uveitis, no sacroiliitis on imaging, no past IBP, no family history. Does he classify as peripheral SpA under ASAS 2011?”
Uveitis and sacroiliitis patient screening
“My patient presents with current enthesitis and has a confirmed history of uveitis and sacroiliitis on imaging. No arthritis, no dactylitis, no psoriasis, no IBD, no preceding infection, not HLA-B27 positive, no past IBP, no family history of SpA. Does she meet the ASAS peripheral SpA criteria?”
Family history and multi-feature Arm B evaluation
“Patient has current arthritis and dactylitis, past inflammatory back pain, and a family history of SpA. No psoriasis, no IBD, no preceding infection, HLA-B27 negative, no uveitis, no sacroiliitis on imaging, no enthesitis. Please classify using ASAS 2011 peripheral SpA criteria and tell me which arm applies.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/asas_peripheral_spaWhen to prefer
Use this endpoint when you need to apply the specific ASAS 2011 peripheral SpA classification algorithm (Rudwaleit set 2D) and the patient has a peripheral presentation (arthritis, enthesitis, or dactylitis) rather than predominant axial symptoms. Do not use for axial SpA classification (ASAS 2009 axial criteria apply there), and do not confuse with ESSG or Amor criteria — those are distinct algorithms not implemented here.
Side effects
- Missing required boolean query parameters returns a validation error
- Entry criterion not met (no current arthritis, enthesitis, or dactylitis) results in classification not met regardless of arm features
- Ambiguous or missing HLA-B27 or imaging results passed as false may undercount arm A features
- Caller-assigned inputs that do not reflect actual clinical findings will produce unreliable classification output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
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