Infection / VTE · LIVE

SVS WIfI threatened limb grades

WIfI

Apply Mills 2014 SVS WIfI grades and return the three independent grades (wound 0-3, ischemia 0-3, foot_infection 0-3) plus a wifi label like W0-I0-fI0.

LIVE $0.005 USDC GET /api/calc/wifi

Markdown: /docs/wifi.md · Canonical: https://magentlab.com/docs/wifi

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

What it computes

Apply Mills 2014 SVS WIfI grades and return the three independent grades (wound 0-3, ischemia 0-3, foot_infection 0-3) plus a wifi label like W0-I0-fI0.

When to use

When an agent already has caller-assigned Mills 2014 wound, ischemia, and foot infection grades for a threatened lower extremity and needs the published WIfI label. magent does not inspect wounds or measure ABI, ankle pressure, or toe pressure.

When not to use

• Not a medical device.
• Not an amputation or revascularization order. This tool does not report clinical stage 1-4 or Delphi amputation-risk or revascularization-benefit tables.
• magent does not inspect wounds. Wound grade is caller-assigned.
• magent does not measure ABI, ankle pressure, or toe pressure. Ischemia grade is caller-assigned; this tool does not compute ischemia from pressures.
• The three grades are independent. This tool does not return a summed WIfI total. Not PEDIS.

Formula

WIfI is three independent Mills 2014 SVS grades, not a summed total: wound 0-3 (0 no ulcer and no gangrene; 1 small shallow distal ulcer without gangrene; 2 deeper ulcer with exposed bone, joint, or tendon, or gangrene limited to digits; 3 extensive deep ulcer or extensive gangrene); ischemia 0-3 as assigned by the caller (0 none; 1 mild; 2 moderate; 3 severe); foot_infection 0-3 (0 none; 1 skin and subcutaneous only; 2 deeper than skin without SIRS; 3 infection with SIRS). Label is W{wound}-I{ischemia}-fI{foot_infection}

Citation

Title

The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: risk stratification based on wound, ischemia, and foot infection (WIfI).

Authors

Mills JL, Conte MS, Armstrong DG, et al.

Source

J Vasc Surg. 2014;59(1):220-234.e1-2

DOI

10.1016/j.jvs.2013.08.003

Worked example

Also searched as

• WIfI classification
• SVS WIfI
• Mills WIfI
• wound ischemia foot infection
• threatened limb classification
• WIfI grades
• Society for Vascular Surgery WIfI
• WIfI 2014

Try

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

/api/calc/wifi?wound=0&ischemia=0&foot_infection=0

Full URL: https://api.magentlab.com/api/calc/wifi?wound=0&ischemia=0&foot_infection=0

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/wifi?wound=0&ischemia=0&foot_infection=0"

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/wifi 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": [
    {
      "foot_infection": "0",
      "ischemia": "0",
      "wound": "0"
    },
    {
      "foot_infection": "0",
      "ischemia": "0",
      "wound": "0"
    }
  ]
}

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/wifi",
  "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": "Mills JL, Conte MS, Armstrong DG, et al.",
        "doi": "10.1016/j.jvs.2013.08.003",
        "id": "mills-2014",
        "pmid": "24126108",
        "source": "J Vasc Surg. 2014;59(1):220-234.e1-2",
        "title": "The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: risk stratification based on wound, ischemia, and foot infection (WIfI)."
      },
      "formula": "wifi",
      "formula_expression": "WIfI is three independent Mills 2014 SVS grades, not a summed total: wound 0-3 (0 no ulcer and no gangrene; 1 small shallow distal ulcer without gangrene; 2 deeper ulcer with exposed bone, joint, or tendon, or gangrene limited to digits; 3 extensive deep ulcer or extensive gangrene); ischemia 0-3 as assigned by the caller (0 none; 1 mild; 2 moderate; 3 severe); foot_infection 0-3 (0 none; 1 skin and subcutaneous only; 2 deeper than skin without SIRS; 3 infection with SIRS). Label is W{wound}-I{ischemia}-fI{foot_infection}",
      "criteria": [
        {
          "value": 0,
          "factor": "wound",
          "met": true
        },
        {
          "value": 0,
          "factor": "ischemia",
          "met": true
        },
        {
          "value": 0,
          "factor": "foot_infection",
          "met": true
        }
      ],
      "wound": 0,
      "foot_infection": 0,
      "ischemia": 0,
      "wifi": "W0-I0-fI0"
    },
    {
      "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": "Mills JL, Conte MS, Armstrong DG, et al.",
        "doi": "10.1016/j.jvs.2013.08.003",
        "id": "mills-2014",
        "pmid": "24126108",
        "source": "J Vasc Surg. 2014;59(1):220-234.e1-2",
        "title": "The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: risk stratification based on wound, ischemia, and foot infection (WIfI)."
      },
      "formula": "wifi",
      "formula_expression": "WIfI is three independent Mills 2014 SVS grades, not a summed total: wound 0-3 (0 no ulcer and no gangrene; 1 small shallow distal ulcer without gangrene; 2 deeper ulcer with exposed bone, joint, or tendon, or gangrene limited to digits; 3 extensive deep ulcer or extensive gangrene); ischemia 0-3 as assigned by the caller (0 none; 1 mild; 2 moderate; 3 severe); foot_infection 0-3 (0 none; 1 skin and subcutaneous only; 2 deeper than skin without SIRS; 3 infection with SIRS). Label is W{wound}-I{ischemia}-fI{foot_infection}",
      "criteria": [
        {
          "value": 0,
          "factor": "wound",
          "met": true
        },
        {
          "value": 0,
          "factor": "ischemia",
          "met": true
        },
        {
          "value": 0,
          "factor": "foot_infection",
          "met": true
        }
      ],
      "wound": 0,
      "foot_infection": 0,
      "ischemia": 0,
      "wifi": "W0-I0-fI0"
    }
  ]
}

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": "Mills JL, Conte MS, Armstrong DG, et al.",
    "doi": "10.1016/j.jvs.2013.08.003",
    "id": "mills-2014",
    "pmid": "24126108",
    "source": "J Vasc Surg. 2014;59(1):220-234.e1-2",
    "title": "The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: risk stratification based on wound, ischemia, and foot infection (WIfI)."
  },
  "formula": "wifi",
  "formula_expression": "WIfI is three independent Mills 2014 SVS grades, not a summed total: wound 0-3 (0 no ulcer and no gangrene; 1 small shallow distal ulcer without gangrene; 2 deeper ulcer with exposed bone, joint, or tendon, or gangrene limited to digits; 3 extensive deep ulcer or extensive gangrene); ischemia 0-3 as assigned by the caller (0 none; 1 mild; 2 moderate; 3 severe); foot_infection 0-3 (0 none; 1 skin and subcutaneous only; 2 deeper than skin without SIRS; 3 infection with SIRS). Label is W{wound}-I{ischemia}-fI{foot_infection}",
  "criteria": [
    {
      "value": 0,
      "factor": "wound",
      "met": true
    },
    {
      "value": 0,
      "factor": "ischemia",
      "met": true
    },
    {
      "value": 0,
      "factor": "foot_infection",
      "met": true
    }
  ],
  "wound": 0,
  "foot_infection": 0,
  "ischemia": 0,
  "wifi": "W0-I0-fI0"
}

Client errors (HTTP 400)

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

Related tools

• PEDIS — Apply Schaper 2004 IWGDF PEDIS research grades and return the five independent grades (perfusion 1-3, extent 1-3, depth 1-3, infection 1-4, sensation 1-2) plus a pedis label like 1-1-1-1-1.

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.