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ASAS 2009 Axial Spondyloarthritis Classification Calculator
x402
ASAS 2009 Axial Spondyloarthritis 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 2026-09-15).
Applies the ASAS 2009 axial spondyloarthritis classification criteria (Rudwaleit set 3a) via imaging and clinical arms to determine if a patient meets criteria for axial SpA classification.
Price / call$0.005
Success—
StatusUnknown
How this service works
ASAS 2009 axial SpA classification (Rudwaleit set 3a / fig 2). Required: chronic back pain ≥3 months and age at onset <45. Imaging arm: MRI or modified New York sacroiliitis plus ≥1 of 11 SpA features. Clinical arm: HLA-B27 plus ≥2 other features (HLA-B27 does not count toward those two). Not a diagnosis. Not peripheral ASAS 2011. Not modified New York AS-only. magent does not read films or assay HLA-B27.
Output
Returns a structured result indicating whether the patient meets ASAS 2009 axial SpA classification criteria, specifying which arm (imaging or clinical) was satisfied, the count of SpA features present, and the logical breakdown of each arm's criteria evaluation. This is a classification tool, not a clinical diagnosis.
Example use cases
Rheumatology clinic documentation support
“I need to classify a 28-year-old patient with chronic back pain starting at age 24. MRI shows sacroiliitis. They have inflammatory back pain and dactylitis, are HLA-B27 positive, have elevated CRP, no radiographic sacroiliitis, no arthritis, no enthesitis, no uveitis, no psoriasis, no IBD, no NSAID response, and no family history. Run the ASAS 2009 axial SpA classification for me.”
HLA-B27 positive patient with no imaging findings
“Can you check ASAS 2009 axial SpA criteria for a patient with chronic back pain onset at age 38, HLA-B27 positive, no MRI or radiographic sacroiliitis, but with inflammatory back pain and a good response to NSAIDs? No arthritis, enthesitis, uveitis, dactylitis, psoriasis, IBD, family history, or elevated CRP.”
Research cohort eligibility screening
“For a research cohort, I need to check ASAS 2009 axial SpA classification for a 41-year-old with back pain since age 36. Radiographic sacroiliitis is present, HLA-B27 negative, inflammatory back pain yes, family history of SpA yes, uveitis yes, no arthritis, no enthesitis, no dactylitis, no psoriasis, no IBD, no NSAID response, elevated CRP false. Does this patient meet classification criteria?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/asas_axial_spaWhen to prefer
Use this endpoint when you need to apply specifically the ASAS 2009 axial SpA classification criteria (Rudwaleit, set 3a / fig 2) — covering both the imaging arm and the clinical HLA-B27 arm — for patients with chronic back pain of ≥3 months and onset before age 45. Do not use for peripheral SpA (use ASAS 2011 peripheral criteria instead), modified New York criteria for AS only, or any case requiring actual radiology reading or laboratory HLA-B27 assay, which must be supplied by the caller.
Side effects
- Missing required boolean parameters (e.g. chronic_back_pain_ge_3_months, hla_b27) returns a validation error
- Age at onset ≥45 or chronic back pain <3 months causes entry criteria failure — patient is not classifiable
- HLA-B27 false with no imaging findings means neither arm can be satisfied
- Caller misassigning clinical findings (e.g. counting HLA-B27 as one of the two required clinical arm SpA features) will yield incorrect results — the API enforces that HLA-B27 is obligatory but does not count toward the two other features
- Peripheral ASAS 2011 criteria or modified New York AS-only criteria cannot be applied by this endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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