MAGENT

Infection / VTE · LIVE

PEDIS diabetic foot ulcer grades

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.

LIVE $0.005 USDC GET /api/calc/pedis

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

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

What it computes

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.

When to use

When an agent already has caller-assigned PEDIS grades for a diabetic foot ulcer as in Schaper 2004 and needs the published five-grade label. magent does not measure the ulcer, diagnose PAD, or probe bone.

When not to use

  • Not a medical device.
  • Not IWGDF treatment guidance. This tool is the Schaper 2004 research classification only.
  • magent does not measure the ulcer or diagnose PAD. The caller assigns perfusion, extent, depth, infection, and sensation.
  • magent does not probe bone. Depth grade 3 (bone and/or joint) is caller-assigned.
  • The five grades are independent. This tool does not return a summed PEDIS total or extra bands.

Formula

PEDIS is five independent Schaper 2004 IWGDF grades, not a summed total: perfusion 1-3 (1 no PAD symptoms/signs; 2 PAD without critical limb ischemia; 3 critical limb ischemia); extent 1-3 (ulcer area 1 <1 cm2; 2 1-3 cm2; 3 >3 cm2); depth 1-3 (1 superficial, not through dermis to subcutaneous; 2 to subcutaneous/fascia/muscle/tendon, not bone/joint; 3 bone and/or joint); infection 1-4 (1 none; 2 skin/subcutaneous only; 3 deeper than skin without SIRS; 4 infection with SIRS); sensation 1-2 (1 no loss of protective sensation; 2 loss of protective sensation). Label is perfusion-extent-depth-infection-sensation

Citation

Title
Diabetic foot ulcer classification system for research purposes: a progress report on criteria for including patients in research studies
Authors
Schaper NC
Source
Diabetes Metab Res Rev. 2004;20 Suppl 1:S90-S95
DOI
10.1002/dmrr.464

Worked example

All five grades 1

Given: depth=1extent=1infection=1perfusion=1sensation=1

  1. perfusion 1, extent 1, depth 1, infection 1, sensation 1
  2. Each axis is the published grade-1 band
  3. pedis label is 1-1-1-1-1; grades are not summed

Also searched as

  • PEDIS classification
  • PEDIS grades
  • IWGDF PEDIS
  • Schaper PEDIS
  • diabetic foot ulcer classification
  • perfusion extent depth infection sensation
  • PEDIS 2004
  • diabetic foot research grades

Try

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

/api/calc/pedis?perfusion=1&extent=1&depth=1&infection=1&sensation=1

Full URL: https://api.magentlab.com/api/calc/pedis?perfusion=1&extent=1&depth=1&infection=1&sensation=1

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/pedis?perfusion=1&extent=1&depth=1&infection=1&sensation=1"

Parameters

Name Type Required Description
perfusion integer required Perfusion grade 1-3 as assigned by the caller (Schaper 2004): 1 no PAD symptoms/signs; 2 PAD without critical limb ischemia; 3 critical limb ischemia. magent does not diagnose PAD or measure pulses or pressures.
extent integer required Extent (ulcer area) grade 1-3 as assigned by the caller (Schaper 2004): 1 <1 cm2; 2 1-3 cm2; 3 >3 cm2. magent does not measure the ulcer.
depth integer required Depth grade 1-3 as assigned by the caller (Schaper 2004): 1 superficial (not through dermis to subcutaneous); 2 to subcutaneous/fascia/muscle/tendon (not bone/joint); 3 bone and/or joint. magent does not probe bone.
infection integer required Infection grade 1-4 as assigned by the caller (Schaper 2004): 1 none; 2 skin/subcutaneous only; 3 deeper than skin (abscess, osteomyelitis, septic arthritis, fasciitis) without SIRS; 4 infection with SIRS. magent does not diagnose infection.
sensation integer required Sensation grade 1-2 as assigned by the caller (Schaper 2004): 1 no loss of protective sensation; 2 loss of protective sensation. magent does not test sensation.

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/pedis 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": [
    {
      "depth": "1",
      "extent": "1",
      "infection": "1",
      "perfusion": "1",
      "sensation": "1"
    },
    {
      "depth": "1",
      "extent": "1",
      "infection": "1",
      "perfusion": "1",
      "sensation": "1"
    }
  ]
}

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/pedis",
  "items": [
    {
      "depth": 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": "Schaper NC",
        "doi": "10.1002/dmrr.464",
        "id": "schaper-2004",
        "pmid": "15150852",
        "source": "Diabetes Metab Res Rev. 2004;20 Suppl 1:S90-S95",
        "title": "Diabetic foot ulcer classification system for research purposes: a progress report on criteria for including patients in research studies"
      },
      "formula": "pedis",
      "formula_expression": "PEDIS is five independent Schaper 2004 IWGDF grades, not a summed total: perfusion 1-3 (1 no PAD symptoms/signs; 2 PAD without critical limb ischemia; 3 critical limb ischemia); extent 1-3 (ulcer area 1 <1 cm2; 2 1-3 cm2; 3 >3 cm2); depth 1-3 (1 superficial, not through dermis to subcutaneous; 2 to subcutaneous/fascia/muscle/tendon, not bone/joint; 3 bone and/or joint); infection 1-4 (1 none; 2 skin/subcutaneous only; 3 deeper than skin without SIRS; 4 infection with SIRS); sensation 1-2 (1 no loss of protective sensation; 2 loss of protective sensation). Label is perfusion-extent-depth-infection-sensation",
      "criteria": [
        {
          "value": 1,
          "factor": "perfusion",
          "met": true
        },
        {
          "value": 1,
          "factor": "extent",
          "met": true
        },
        {
          "value": 1,
          "factor": "depth",
          "met": true
        },
        {
          "value": 1,
          "factor": "infection",
          "met": true
        },
        {
          "value": 1,
          "factor": "sensation",
          "met": true
        }
      ],
      "extent": 1,
      "infection": 1,
      "pedis": "1-1-1-1-1",
      "perfusion": 1,
      "sensation": 1
    },
    {
      "depth": 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": "Schaper NC",
        "doi": "10.1002/dmrr.464",
        "id": "schaper-2004",
        "pmid": "15150852",
        "source": "Diabetes Metab Res Rev. 2004;20 Suppl 1:S90-S95",
        "title": "Diabetic foot ulcer classification system for research purposes: a progress report on criteria for including patients in research studies"
      },
      "formula": "pedis",
      "formula_expression": "PEDIS is five independent Schaper 2004 IWGDF grades, not a summed total: perfusion 1-3 (1 no PAD symptoms/signs; 2 PAD without critical limb ischemia; 3 critical limb ischemia); extent 1-3 (ulcer area 1 <1 cm2; 2 1-3 cm2; 3 >3 cm2); depth 1-3 (1 superficial, not through dermis to subcutaneous; 2 to subcutaneous/fascia/muscle/tendon, not bone/joint; 3 bone and/or joint); infection 1-4 (1 none; 2 skin/subcutaneous only; 3 deeper than skin without SIRS; 4 infection with SIRS); sensation 1-2 (1 no loss of protective sensation; 2 loss of protective sensation). Label is perfusion-extent-depth-infection-sensation",
      "criteria": [
        {
          "value": 1,
          "factor": "perfusion",
          "met": true
        },
        {
          "value": 1,
          "factor": "extent",
          "met": true
        },
        {
          "value": 1,
          "factor": "depth",
          "met": true
        },
        {
          "value": 1,
          "factor": "infection",
          "met": true
        },
        {
          "value": 1,
          "factor": "sensation",
          "met": true
        }
      ],
      "extent": 1,
      "infection": 1,
      "pedis": "1-1-1-1-1",
      "perfusion": 1,
      "sensation": 1
    }
  ]
}

Response

Field Type Description
formula string pedis
formula_expression string Five independent Schaper 2004 IWGDF PEDIS grades, not a summed total
perfusion integer Caller-assigned perfusion grade 1-3
extent integer Caller-assigned extent grade 1-3
depth integer Caller-assigned depth grade 1-3
infection integer Caller-assigned infection grade 1-4
sensation integer Caller-assigned sensation grade 1-2
pedis string perfusion-extent-depth-infection-sensation label, for example 1-1-1-1-1
criteria array Per-axis rows with factor, met, and value for the five PEDIS grades
citation object Schaper 2004 Diabetes Metab Res Rev citation
disclaimer string Not-a-device notice

Example JSON

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

{
  "depth": 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": "Schaper NC",
    "doi": "10.1002/dmrr.464",
    "id": "schaper-2004",
    "pmid": "15150852",
    "source": "Diabetes Metab Res Rev. 2004;20 Suppl 1:S90-S95",
    "title": "Diabetic foot ulcer classification system for research purposes: a progress report on criteria for including patients in research studies"
  },
  "formula": "pedis",
  "formula_expression": "PEDIS is five independent Schaper 2004 IWGDF grades, not a summed total: perfusion 1-3 (1 no PAD symptoms/signs; 2 PAD without critical limb ischemia; 3 critical limb ischemia); extent 1-3 (ulcer area 1 <1 cm2; 2 1-3 cm2; 3 >3 cm2); depth 1-3 (1 superficial, not through dermis to subcutaneous; 2 to subcutaneous/fascia/muscle/tendon, not bone/joint; 3 bone and/or joint); infection 1-4 (1 none; 2 skin/subcutaneous only; 3 deeper than skin without SIRS; 4 infection with SIRS); sensation 1-2 (1 no loss of protective sensation; 2 loss of protective sensation). Label is perfusion-extent-depth-infection-sensation",
  "criteria": [
    {
      "value": 1,
      "factor": "perfusion",
      "met": true
    },
    {
      "value": 1,
      "factor": "extent",
      "met": true
    },
    {
      "value": 1,
      "factor": "depth",
      "met": true
    },
    {
      "value": 1,
      "factor": "infection",
      "met": true
    },
    {
      "value": 1,
      "factor": "sensation",
      "met": true
    }
  ],
  "extent": 1,
  "infection": 1,
  "pedis": "1-1-1-1-1",
  "perfusion": 1,
  "sensation": 1
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_pedis perfusion 1-3, extent 1-3, depth 1-3, infection 1-4, and sensation 1-2 (Schaper 2004 IWGDF PEDIS grades). Returned before settlement; you are not charged.
400 invalid_items POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400 invalid_item_count items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400 invalid_item each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

  • LRINEC — Sum the Wong 2004 LRINEC laboratory table and return whether the total is at or above the published cutoff of 6.

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.