# PEDIS diabetic foot ulcer grades PEDIS Status: LIVE Price: $0.005 USDC `GET /api/calc/pedis` HTML: https://magentlab.com/docs/pedis Markdown: https://magentlab.com/docs/pedis.md 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 [Diabetic foot ulcer classification system for research purposes: a progress report on criteria for including patients in research studies](https://doi.org/10.1002/dmrr.464) Schaper NC Diabetes Metab Res Rev. 2004;20 Suppl 1:S90-S95 DOI: [10.1002/dmrr.464](https://doi.org/10.1002/dmrr.464) ## Worked example ### All five grades 1 Given: `depth=1, extent=1, infection=1, perfusion=1, sensation=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 ## Parameters - `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. Method: `POST /api/calc/pedis` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: 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: ```json { "items": [ { "depth": "1", "extent": "1", "infection": "1", "perfusion": "1", "sensation": "1" }, { "depth": "1", "extent": "1", "infection": "1", "perfusion": "1", "sensation": "1" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/pedis Example 200: ```json { "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 fields - `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 Frozen fixture. Not a live lookup. ```json { "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 } ``` ## Errors - HTTP 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. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [LRINEC](https://magentlab.com/docs/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. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/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.