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ASAS peripheral SpA classification criteria

ASAS peripheral SpA

Apply the 2011 ASAS classification criteria for peripheral spondyloarthritis (Rudwaleit set 2D / figure 1): require current arthritis, enthesitis, or dactylitis, then return whether arm A (≥1 of 6 SpA features) or arm B (≥2 of 5 additional features) classifies peripheral SpA. Not a diagnosis.

LIVE $0.005 USDC GET /api/calc/asas_peripheral_spa

Markdown: /docs/asas-peripheral-spa.md · Canonical: https://magentlab.com/docs/asas-peripheral-spa

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Apply the 2011 ASAS classification criteria for peripheral spondyloarthritis (Rudwaleit set 2D / figure 1): require current arthritis, enthesitis, or dactylitis, then return whether arm A (≥1 of 6 SpA features) or arm B (≥2 of 5 additional features) classifies peripheral SpA. Not a diagnosis.

When to use

When an agent already has caller-assigned Rudwaleit 2011 entry and SpA feature flags and needs the published peripheral SpA classification result for research, not a diagnosis, not ASAS 2009 axial, and not ESSG/Amor.

When not to use

• Not a medical device and not a diagnosis of peripheral spondyloarthritis, psoriatic arthritis, reactive arthritis, or IBD-associated SpA. Classification criteria for research.
• Entry (current arthritis, enthesitis, or dactylitis) must be met or the request is HTTP 400 and is not returned as classified=false.
• Age at onset is a study limitation (Rudwaleit 2011 usually ≤45 years) and is not a parameter and not an HTTP 400.
• This tool is ASAS 2011 peripheral SpA classification (set 2D) only. It is not the 2009 ASAS axial criteria and not ESSG or Amor criteria.
• Arthritis, enthesitis, dactylitis, psoriasis, IBD, preceding infection, HLA-B27, uveitis, sacroiliitis on imaging, IBP in the past, and family history are caller-assigned. magent does not examine joints or assay HLA-B27.

Formula

ASAS 2011 peripheral SpA classification (Rudwaleit set 2D / fig 1 + table 5): required arthritis or enthesitis or dactylitis (current). arm_a iff ≥1 of psoriasis, ibd, preceding_infection, hla_b27, uveitis, sacroiliitis_on_imaging. arm_b iff ≥2 of arthritis, enthesitis, dactylitis, ibp_past, family_history_spa (same caller flags as entry for arthritis/enthesitis/dactylitis). classified iff entry and (arm_a or arm_b). Not a diagnosis. Not ASAS 2009 axial. Not ESSG/Amor

Citation

Title

The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general

Authors

Rudwaleit M, van der Heijde D, Landewé R, Akkoc N, Brandt J, Chou CT, Dougados M, Huang F, Gu J, Kirazli Y, Van den Bosch F, Olivieri I, Roussou E, Scarpato S, Sørensen IJ, Valle-Oñate R, Weber U, Wei J, Sieper J

Source

Ann Rheum Dis. 2011;70(1):25-31

DOI

10.1136/ard.2010.133645

Worked example

Also searched as

• ASAS peripheral spondyloarthritis
• ASAS 2011 classification criteria
• Rudwaleit peripheral SpA
• peripheral spondyloarthritis classification
• ASAS pSpA
• not ASAS 2009 axial
• not ESSG Amor criteria
• HLA-B27 peripheral SpA

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/asas_peripheral_spa?arthritis=true&enthesitis=false&dactylitis=false&psoriasis=true&ibd=false&preceding_infection=false&hla_b27=false&uveitis=false&sacroiliitis_on_imaging=false&ibp_past=false&family_history_spa=false

Full URL: https://api.magentlab.com/api/calc/asas_peripheral_spa?arthritis=true&enthesitis=false&dactylitis=false&psoriasis=true&ibd=false&preceding_infection=false&hla_b27=false&uveitis=false&sacroiliitis_on_imaging=false&ibp_past=false&family_history_spa=false

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/asas_peripheral_spa?arthritis=true&enthesitis=false&dactylitis=false&psoriasis=true&ibd=false&preceding_infection=false&hla_b27=false&uveitis=false&sacroiliitis_on_imaging=false&ibp_past=false&family_history_spa=false"

Parameters

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/asas_peripheral_spa Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
• The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
• HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
• Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
• x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "arthritis": "true",
      "dactylitis": "false",
      "enthesitis": "false",
      "family_history_spa": "false",
      "hla_b27": "false",
      "ibd": "false",
      "ibp_past": "false",
      "preceding_infection": "false",
      "psoriasis": "true",
      "sacroiliitis_on_imaging": "false",
      "uveitis": "false"
    },
    {
      "arthritis": "true",
      "dactylitis": "false",
      "enthesitis": "false",
      "family_history_spa": "false",
      "hla_b27": "false",
      "ibd": "false",
      "ibp_past": "false",
      "preceding_infection": "false",
      "psoriasis": "true",
      "sacroiliitis_on_imaging": "false",
      "uveitis": "false"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/asas_peripheral_spa",
  "items": [
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Rudwaleit M, van der Heijde D, Landewé R, Akkoc N, Brandt J, Chou CT, Dougados M, Huang F, Gu J, Kirazli Y, Van den Bosch F, Olivieri I, Roussou E, Scarpato S, Sørensen IJ, Valle-Oñate R, Weber U, Wei J, Sieper J",
        "doi": "10.1136/ard.2010.133645",
        "id": "rudwaleit-2011",
        "pmid": "21109520",
        "source": "Ann Rheum Dis. 2011;70(1):25-31",
        "title": "The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general"
      },
      "formula": "asas_peripheral_spa",
      "formula_expression": "ASAS 2011 peripheral SpA classification (Rudwaleit set 2D / fig 1 + table 5): required arthritis or enthesitis or dactylitis (current). arm_a iff ≥1 of psoriasis, ibd, preceding_infection, hla_b27, uveitis, sacroiliitis_on_imaging. arm_b iff ≥2 of arthritis, enthesitis, dactylitis, ibp_past, family_history_spa (same caller flags as entry for arthritis/enthesitis/dactylitis). classified iff entry and (arm_a or arm_b). Not a diagnosis. Not ASAS 2009 axial. Not ESSG/Amor",
      "classified": true,
      "arm_a": true,
      "arm_a_count": 1,
      "arm_b": false,
      "arm_b_count": 1
    },
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Rudwaleit M, van der Heijde D, Landewé R, Akkoc N, Brandt J, Chou CT, Dougados M, Huang F, Gu J, Kirazli Y, Van den Bosch F, Olivieri I, Roussou E, Scarpato S, Sørensen IJ, Valle-Oñate R, Weber U, Wei J, Sieper J",
        "doi": "10.1136/ard.2010.133645",
        "id": "rudwaleit-2011",
        "pmid": "21109520",
        "source": "Ann Rheum Dis. 2011;70(1):25-31",
        "title": "The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general"
      },
      "formula": "asas_peripheral_spa",
      "formula_expression": "ASAS 2011 peripheral SpA classification (Rudwaleit set 2D / fig 1 + table 5): required arthritis or enthesitis or dactylitis (current). arm_a iff ≥1 of psoriasis, ibd, preceding_infection, hla_b27, uveitis, sacroiliitis_on_imaging. arm_b iff ≥2 of arthritis, enthesitis, dactylitis, ibp_past, family_history_spa (same caller flags as entry for arthritis/enthesitis/dactylitis). classified iff entry and (arm_a or arm_b). Not a diagnosis. Not ASAS 2009 axial. Not ESSG/Amor",
      "classified": true,
      "arm_a": true,
      "arm_a_count": 1,
      "arm_b": false,
      "arm_b_count": 1
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Rudwaleit M, van der Heijde D, Landewé R, Akkoc N, Brandt J, Chou CT, Dougados M, Huang F, Gu J, Kirazli Y, Van den Bosch F, Olivieri I, Roussou E, Scarpato S, Sørensen IJ, Valle-Oñate R, Weber U, Wei J, Sieper J",
    "doi": "10.1136/ard.2010.133645",
    "id": "rudwaleit-2011",
    "pmid": "21109520",
    "source": "Ann Rheum Dis. 2011;70(1):25-31",
    "title": "The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general"
  },
  "formula": "asas_peripheral_spa",
  "formula_expression": "ASAS 2011 peripheral SpA classification (Rudwaleit set 2D / fig 1 + table 5): required arthritis or enthesitis or dactylitis (current). arm_a iff ≥1 of psoriasis, ibd, preceding_infection, hla_b27, uveitis, sacroiliitis_on_imaging. arm_b iff ≥2 of arthritis, enthesitis, dactylitis, ibp_past, family_history_spa (same caller flags as entry for arthritis/enthesitis/dactylitis). classified iff entry and (arm_a or arm_b). Not a diagnosis. Not ASAS 2009 axial. Not ESSG/Amor",
  "classified": true,
  "arm_a": true,
  "arm_a_count": 1,
  "arm_b": false,
  "arm_b_count": 1
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

Related tools

• ASAS axial SpA — Apply the 2009 ASAS classification criteria for axial spondyloarthritis (Rudwaleit set 3a / figure 2): require chronic back pain ≥3 months with age at onset <45, then return whether the imaging arm (sacroiliitis plus ≥1 SpA feature) or the clinical arm (HLA-B27 plus ≥2 other SpA features) classifies axial SpA. Not a diagnosis.
• ACR/EULAR gout — Apply the 2015 ACR/EULAR gout classification criteria (Neogi Table 2): require the entry episode, classify immediately if MSU crystals are present, otherwise return the Step 3 score (max 23) and whether score ≥8 classifies gout. Not a gout diagnosis.
• ACR/EULAR Sjögren — Apply the 2016 ACR/EULAR classification criteria for primary Sjögren's syndrome (Shiboski Table 3): require published inclusion and no exclusion, then return the five-item weighted score and whether the ≥4 cut point classifies primary Sjögren's syndrome. Not a diagnosis.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

• HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
• exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
• HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.