Blast lung injury severity (Pizov)

BLI

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.

LIVE $0.005 USDC GET /api/calc/bli

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

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

What it computes

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

Title: Blast lung injury from an explosion on a civilian bus
Authors: Pizov R, Oppenheim-Eden A, Matot I, Weiss YG, Eidelman LA, Rivkind AI, Sprung CL
Source: Chest. 1999;115(1):165-172
DOI: 10.1378/chest.115.1.165

Worked example

Mild BLI, PaO2/FiO2 250

Given: bronchopleural_fistula=falseinfiltrates=localizedpf_ratio=250pneumothorax=false

pf_ratio 250 > 200, infiltrates localized, pneumothorax false, bronchopleural_fistula false → mild

Moderate BLI, no pneumothorax

Given: bronchopleural_fistula=falseinfiltrates=diffusepf_ratio=130pneumothorax=false

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

Try

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

/api/calc/bli?pf_ratio=250&infiltrates=localized&pneumothorax=false&bronchopleural_fistula=false

Full URL: https://api.magentlab.com/api/calc/bli?pf_ratio=250&infiltrates=localized&pneumothorax=false&bronchopleural_fistula=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/bli?pf_ratio=250&infiltrates=localized&pneumothorax=false&bronchopleural_fistula=false"

Parameters

Name	Type	Required	Description
`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.

POST /api/calc/bli 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": [
    {
      "bronchopleural_fistula": "false",
      "infiltrates": "localized",
      "pf_ratio": "250",
      "pneumothorax": "false"
    },
    {
      "bronchopleural_fistula": "false",
      "infiltrates": "localized",
      "pf_ratio": "250",
      "pneumothorax": "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/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

Field	Type	Description
`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

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

{
  "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
}

Client errors (HTTP 400)

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

HTTP	Code	When
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.
400	`invalid_flag`	boolean clinical flags must be true or false 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

PaO2/FiO2 ratio — Compute the PaO2/FiO2 ratio as arterial PO2 in mm Hg divided by inspired oxygen fraction.
Murray lung injury score — 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. 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.