# Blast lung injury severity (Pizov) BLI Status: LIVE Price: $0.005 USDC `GET /api/calc/bli` HTML: https://magentlab.com/docs/bli Markdown: https://magentlab.com/docs/bli.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Return Pizov 1999 blast lung injury severity (mild, moderate, or severe) only when caller-assigned PaO2/FiO2, infiltrates, pneumothorax, and bronchopleural fistula match one published definition exactly. ## When to use When an agent already has a PaO2/FiO2 ratio and caller-assigned infiltrate pattern, pneumothorax, and bronchopleural fistula after a blast, and needs the published Pizov 1999 class. magent does not read a chest radiograph or assay blood gas. Not a ventilator prescription. ## When not to use - Not a medical device. Not a ventilator prescription. magent does not set PEEP, FiO2, or mode. - magent does not read a chest radiograph or assay blood gas. All findings are caller-assigned. - Three published Pizov 1999 definitions only. Combinations that match none of the three are rejected; magent does not invent a nearest class. Not a numeric point total. ## Formula ``` mild iff pf_ratio > 200 and infiltrates localized and no pneumothorax and no bronchopleural fistula; moderate iff 60 <= pf_ratio <= 200 and infiltrates diffuse and no bronchopleural fistula (pneumothorax optional); severe iff pf_ratio < 60 and infiltrates bilateral and bronchopleural fistula; unmatched combinations are invalid (Pizov 1999). Not a numeric point total ``` ## Citation [Blast lung injury from an explosion on a civilian bus](https://doi.org/10.1378/chest.115.1.165) Pizov R, Oppenheim-Eden A, Matot I, Weiss YG, Eidelman LA, Rivkind AI, Sprung CL Chest. 1999;115(1):165-172 DOI: [10.1378/chest.115.1.165](https://doi.org/10.1378/chest.115.1.165) ## Worked example ### Mild BLI, PaO2/FiO2 250 Given: `bronchopleural_fistula=false, infiltrates=localized, pf_ratio=250, pneumothorax=false` 1. pf_ratio 250 > 200, infiltrates localized, pneumothorax false, bronchopleural_fistula false → mild ### Moderate BLI, no pneumothorax Given: `bronchopleural_fistula=false, infiltrates=diffuse, pf_ratio=130, pneumothorax=false` 1. pf_ratio 130 is 60 to 200, infiltrates diffuse, bronchopleural_fistula false, pneumothorax optional false → moderate ## Also searched as - blast lung injury - Pizov BLI - blast lung severity - Pizov 1999 - BLI mild moderate severe - explosion lung injury - blast lung infiltrates - bronchopleural fistula blast ## Parameters - `pf_ratio` (number, required): PaO2/FiO2 ratio in mm Hg (20-600). Pizov 1999 bands: >200 mild, 60 to 200 moderate, <60 severe. Caller-supplied; magent does not assay blood gas. - `infiltrates` (string, required): Lung infiltrate pattern as assigned by the caller: localized (mild), diffuse (moderate; Pizov 1999 diffuse bilateral or unilateral), or bilateral (severe). magent does not read a chest radiograph. - `pneumothorax` (boolean, required): true when the caller assigns pneumothorax. Mild requires false; moderate allows true or false; severe does not use this flag (Pizov 1999). magent does not read a chest radiograph. - `bronchopleural_fistula` (boolean, required): true when the caller assigns bronchopleural fistula. Required true for severe; mild and moderate require false so the combination matches a Pizov 1999 definition exactly. magent does not read a chest radiograph. ## 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/bli` 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": [ { "bronchopleural_fistula": "false", "infiltrates": "localized", "pf_ratio": "250", "pneumothorax": "false" }, { "bronchopleural_fistula": "false", "infiltrates": "localized", "pf_ratio": "250", "pneumothorax": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/bli Example 200: ```json { "count": 2, "path": "/api/calc/bli", "items": [ { "description": "PaO2/FiO2 > 200, localized lung infiltrates, no pneumothorax", "components": [ { "value": 250.0, "factor": "pf_ratio", "met": true }, { "value": "localized", "factor": "infiltrates", "met": true }, { "factor": "pneumothorax", "met": false }, { "factor": "bronchopleural_fistula", "met": false }, { "factor": "mild", "met": true }, { "factor": "moderate", "met": false }, { "factor": "severe", "met": false } ], "severity": "mild", "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": "Pizov R, Oppenheim-Eden A, Matot I, Weiss YG, Eidelman LA, Rivkind AI, Sprung CL", "doi": "10.1378/chest.115.1.165", "id": "pizov-1999", "pmid": "9925079", "source": "Chest. 1999;115(1):165-172", "title": "Blast lung injury from an explosion on a civilian bus" }, "formula": "bli", "formula_expression": "mild iff pf_ratio > 200 and infiltrates localized and no pneumothorax and no bronchopleural fistula; moderate iff 60 <= pf_ratio <= 200 and infiltrates diffuse and no bronchopleural fistula (pneumothorax optional); severe iff pf_ratio < 60 and infiltrates bilateral and bronchopleural fistula; unmatched combinations are invalid (Pizov 1999). Not a numeric point total", "pf_ratio": 250.0, "bronchopleural_fistula": false, "infiltrates": "localized", "pneumothorax": false }, { "description": "PaO2/FiO2 > 200, localized lung infiltrates, no pneumothorax", "components": [ { "value": 250.0, "factor": "pf_ratio", "met": true }, { "value": "localized", "factor": "infiltrates", "met": true }, { "factor": "pneumothorax", "met": false }, { "factor": "bronchopleural_fistula", "met": false }, { "factor": "mild", "met": true }, { "factor": "moderate", "met": false }, { "factor": "severe", "met": false } ], "severity": "mild", "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": "Pizov R, Oppenheim-Eden A, Matot I, Weiss YG, Eidelman LA, Rivkind AI, Sprung CL", "doi": "10.1378/chest.115.1.165", "id": "pizov-1999", "pmid": "9925079", "source": "Chest. 1999;115(1):165-172", "title": "Blast lung injury from an explosion on a civilian bus" }, "formula": "bli", "formula_expression": "mild iff pf_ratio > 200 and infiltrates localized and no pneumothorax and no bronchopleural fistula; moderate iff 60 <= pf_ratio <= 200 and infiltrates diffuse and no bronchopleural fistula (pneumothorax optional); severe iff pf_ratio < 60 and infiltrates bilateral and bronchopleural fistula; unmatched combinations are invalid (Pizov 1999). Not a numeric point total", "pf_ratio": 250.0, "bronchopleural_fistula": false, "infiltrates": "localized", "pneumothorax": false } ] } ``` ## Response fields - `formula` (string): bli - `formula_expression` (string): Published Pizov 1999 mild, moderate, or severe exact-match rule - `pf_ratio` (number): Caller-supplied PaO2/FiO2 in mm Hg used to match a class - `infiltrates` (string): Caller-assigned pattern: localized, diffuse, or bilateral - `pneumothorax` (boolean): true when the caller assigns pneumothorax - `bronchopleural_fistula` (boolean): true when the caller assigns bronchopleural fistula - `severity` (string): mild, moderate, or severe. Mutually exclusive. Not a nearest class. - `description` (string): Pizov 1999 wording for that class - `components` (array): pf_ratio, infiltrates, pneumothorax, bronchopleural_fistula, and class rows - `citation` (object): Pizov 1999 Chest blast lung injury - `disclaimer` (string): Not a medical device ## Example JSON Frozen fixture. Not a live lookup. ```json { "description": "PaO2/FiO2 > 200, localized lung infiltrates, no pneumothorax", "components": [ { "value": 250.0, "factor": "pf_ratio", "met": true }, { "value": "localized", "factor": "infiltrates", "met": true }, { "factor": "pneumothorax", "met": false }, { "factor": "bronchopleural_fistula", "met": false }, { "factor": "mild", "met": true }, { "factor": "moderate", "met": false }, { "factor": "severe", "met": false } ], "severity": "mild", "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": "Pizov R, Oppenheim-Eden A, Matot I, Weiss YG, Eidelman LA, Rivkind AI, Sprung CL", "doi": "10.1378/chest.115.1.165", "id": "pizov-1999", "pmid": "9925079", "source": "Chest. 1999;115(1):165-172", "title": "Blast lung injury from an explosion on a civilian bus" }, "formula": "bli", "formula_expression": "mild iff pf_ratio > 200 and infiltrates localized and no pneumothorax and no bronchopleural fistula; moderate iff 60 <= pf_ratio <= 200 and infiltrates diffuse and no bronchopleural fistula (pneumothorax optional); severe iff pf_ratio < 60 and infiltrates bilateral and bronchopleural fistula; unmatched combinations are invalid (Pizov 1999). Not a numeric point total", "pf_ratio": 250.0, "bronchopleural_fistula": false, "infiltrates": "localized", "pneumothorax": false } ``` ## Errors - HTTP 400 `invalid_bli`: Blast-lung-injury inputs must match a Pizov 1999 mild, moderate, or severe definition from that paper (PaO2/FiO2, infiltrates, pneumothorax, bronchopleural fistula). Returned before settlement; you are not charged. - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false 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 - [PaO2/FiO2 ratio](https://magentlab.com/docs/pf-ratio) — Compute the PaO2/FiO2 ratio as arterial PO2 in mm Hg divided by inspired oxygen fraction. - [Murray lung injury score](https://magentlab.com/docs/murray) — Mean the four Murray 1988 lung injury score components (chest radiograph quadrants, PaO2/FiO2, PEEP, and compliance), each 0–4, and return LIS and injury_band. ## 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.