MAGENT

Emergency · LIVE

Modified Denver BCVI

Apply the Cothren 2005 modified Denver BCVI screening list and return whether any published sign or high-energy risk factor is present (imaging indicated by this screen).

LIVE $0.005 USDC GET /api/calc/denver_bcvi

Markdown: /docs/denver-bcvi.md · Canonical: https://magentlab.com/docs/denver-bcvi

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

What it computes

Apply the Cothren 2005 modified Denver BCVI screening list and return whether any published sign or high-energy risk factor is present (imaging indicated by this screen).

When to use

When an agent has caller-assigned blunt-trauma signs and injury-pattern flags and needs the published modified Denver BCVI imaging screen, not Biffl grade, not expanded Denver, not NEXUS, and not Canadian C-spine.

When not to use

  • Not a medical device. Not a diagnosis. magent does not examine the patient and does not read a CT angiogram.
  • This tool is the Cothren 2005 Table 1 modified Denver BCVI screening list only. It is not Biffl grade I-V, not expanded Denver, not Memphis criteria, not NEXUS, and not the Canadian C-spine rule.
  • Caller assigns published flags. magent does not take numeric age or GCS. Cervical bruit is the published age-<50 indication. DAI is the published GCS <6 compound. C-spine is the published patterns (subluxation, transverse foramen, or C1-C3), not any cervical fracture.
  • Isolated seat-belt abrasion is not a Table 1 item. Screen positive (any published sign or risk factor) is an indication for imaging as published. Does not replace imaging when the screen is positive.

Formula

screen positive iff any published sign (arterial hemorrhage, cervical bruit age <50, expanding cervical hematoma, focal neurologic deficit, neurologic exam incongruous with head CT, or stroke on secondary CT) or any published high-energy risk factor (LeFort II or III, C-spine subluxation or transverse-foramen or C1-C3 fracture, basilar skull fracture with carotid canal, DAI with GCS <6, or near hanging with anoxic brain injury); imaging indicated when screen positive

Citation

Title
Blunt cerebrovascular injuries
Authors
Cothren CC, Moore EE
Source
Clinics (Sao Paulo). 2005;60(6):489-496
DOI
10.1590/S1807-59322005000600011

Worked example

All published flags absent

Given: arterial_hemorrhage=falsebasilar_skull_fracture_carotid_canal=falsecervical_bruit_age_lt_50=falsecspine_subluxation_transverse_foramen_or_c1_c3=falsedai_gcs_lt_6=falseexpanding_cervical_hematoma=falsefocal_neuro_deficit=falselefort_ii_or_iii=falsenear_hanging_anoxic_brain_injury=falseneuro_exam_incongruous_head_ct=falsestroke_on_secondary_ct=false

  1. No Table 1 sign and no Table 1 high-energy risk factor
  2. Screen negative; imaging is not indicated by this screen

Arterial hemorrhage alone is screen positive

Given: arterial_hemorrhage=truebasilar_skull_fracture_carotid_canal=falsecervical_bruit_age_lt_50=falsecspine_subluxation_transverse_foramen_or_c1_c3=falsedai_gcs_lt_6=falseexpanding_cervical_hematoma=falsefocal_neuro_deficit=falselefort_ii_or_iii=falsenear_hanging_anoxic_brain_injury=falseneuro_exam_incongruous_head_ct=falsestroke_on_secondary_ct=false

  1. Arterial hemorrhage is a published Table 1 sign
  2. Screen positive; imaging is indicated by this screen

LeFort II or III alone is screen positive

Given: arterial_hemorrhage=falsebasilar_skull_fracture_carotid_canal=falsecervical_bruit_age_lt_50=falsecspine_subluxation_transverse_foramen_or_c1_c3=falsedai_gcs_lt_6=falseexpanding_cervical_hematoma=falsefocal_neuro_deficit=falselefort_ii_or_iii=truenear_hanging_anoxic_brain_injury=falseneuro_exam_incongruous_head_ct=falsestroke_on_secondary_ct=false

  1. LeFort II or III fracture is a published Table 1 high-energy risk factor
  2. Screen positive; imaging is indicated by this screen

Also searched as

  • Modified Denver BCVI
  • Denver BCVI criteria
  • Cothren Denver screening
  • blunt cerebrovascular injury screen
  • Denver modification BCVI
  • BCVI CTA screening
  • modified Denver cerebrovascular
  • Denver BCVI signs and risk factors

Try

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

/api/calc/denver_bcvi?arterial_hemorrhage=false&cervical_bruit_age_lt_50=false&expanding_cervical_hematoma=false&focal_neuro_deficit=false&neuro_exam_incongruous_head_ct=false&stroke_on_secondary_ct=false&lefort_ii_or_iii=false&cspine_subluxation_transverse_foramen_or_c1_c3=false&basilar_skull_fracture_carotid_canal=false&dai_gcs_lt_6=false&near_hanging_anoxic_brain_injury=false

Full URL: https://api.magentlab.com/api/calc/denver_bcvi?arterial_hemorrhage=false&cervical_bruit_age_lt_50=false&expanding_cervical_hematoma=false&focal_neuro_deficit=false&neuro_exam_incongruous_head_ct=false&stroke_on_secondary_ct=false&lefort_ii_or_iii=false&cspine_subluxation_transverse_foramen_or_c1_c3=false&basilar_skull_fracture_carotid_canal=false&dai_gcs_lt_6=false&near_hanging_anoxic_brain_injury=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/denver_bcvi?arterial_hemorrhage=false&cervical_bruit_age_lt_50=false&expanding_cervical_hematoma=false&focal_neuro_deficit=false&neuro_exam_incongruous_head_ct=false&stroke_on_secondary_ct=false&lefort_ii_or_iii=false&cspine_subluxation_transverse_foramen_or_c1_c3=false&basilar_skull_fracture_carotid_canal=false&dai_gcs_lt_6=false&near_hanging_anoxic_brain_injury=false"

Parameters

Name Type Required Description
arterial_hemorrhage boolean required Arterial hemorrhage as assigned by the caller (Cothren 2005 Table 1 sign). true or false. A true flag is a published indication for imaging. magent does not examine the patient.
cervical_bruit_age_lt_50 boolean required Cervical bruit in a patient younger than 50 years as assigned by the caller (Cothren 2005 Table 1 sign). true or false. Caller assigns the published <50 indication; magent does not take numeric age.
expanding_cervical_hematoma boolean required Expanding cervical hematoma as assigned by the caller (Cothren 2005 Table 1 sign). true or false. A true flag is a published indication for imaging. magent does not examine the neck.
focal_neuro_deficit boolean required Focal neurologic deficit as assigned by the caller (Cothren 2005 Table 1 sign). true or false. A true flag is a published indication for imaging. magent does not examine the patient.
neuro_exam_incongruous_head_ct boolean required Neurologic exam incongruous with head CT scan findings as assigned by the caller (Cothren 2005 Table 1 sign). true or false. magent does not read a head CT.
stroke_on_secondary_ct boolean required Stroke on secondary CT scan as assigned by the caller (Cothren 2005 Table 1 sign). true or false. magent does not read a CT scan.
lefort_ii_or_iii boolean required High-energy transfer with LeFort II or III fracture as assigned by the caller (Cothren 2005 Table 1 risk factor). true or false. A true flag is a published indication for imaging. magent does not interpret facial imaging.
cspine_subluxation_transverse_foramen_or_c1_c3 boolean required High-energy transfer with the published C-spine patterns (subluxation, fracture extending into the transverse foramen, or fracture of C1-C3) as assigned by the caller (Cothren 2005 Table 1 risk factor). true or false. Not any cervical-spine fracture. magent does not interpret C-spine imaging.
basilar_skull_fracture_carotid_canal boolean required High-energy transfer with basilar skull fracture with carotid canal involvement as assigned by the caller (Cothren 2005 Table 1 risk factor). true or false. magent does not interpret skull imaging.
dai_gcs_lt_6 boolean required High-energy transfer with diffuse axonal injury and GCS <6 as assigned by the caller (Cothren 2005 Table 1 risk factor). true or false. Caller assigns the published compound; magent does not take a GCS integer.
near_hanging_anoxic_brain_injury boolean required High-energy transfer with near hanging and anoxic brain injury as assigned by the caller (Cothren 2005 Table 1 risk factor). true or false. magent does not classify mechanism.

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/denver_bcvi 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": [
    {
      "arterial_hemorrhage": "false",
      "basilar_skull_fracture_carotid_canal": "false",
      "cervical_bruit_age_lt_50": "false",
      "cspine_subluxation_transverse_foramen_or_c1_c3": "false",
      "dai_gcs_lt_6": "false",
      "expanding_cervical_hematoma": "false",
      "focal_neuro_deficit": "false",
      "lefort_ii_or_iii": "false",
      "near_hanging_anoxic_brain_injury": "false",
      "neuro_exam_incongruous_head_ct": "false",
      "stroke_on_secondary_ct": "false"
    },
    {
      "arterial_hemorrhage": "false",
      "basilar_skull_fracture_carotid_canal": "false",
      "cervical_bruit_age_lt_50": "false",
      "cspine_subluxation_transverse_foramen_or_c1_c3": "false",
      "dai_gcs_lt_6": "false",
      "expanding_cervical_hematoma": "false",
      "focal_neuro_deficit": "false",
      "lefort_ii_or_iii": "false",
      "near_hanging_anoxic_brain_injury": "false",
      "neuro_exam_incongruous_head_ct": "false",
      "stroke_on_secondary_ct": "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/denver_bcvi",
  "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": "Cothren CC, Moore EE",
        "doi": "10.1590/S1807-59322005000600011",
        "id": "cothren-2005",
        "pmid": "16358138",
        "source": "Clinics (Sao Paulo). 2005;60(6):489-496",
        "title": "Blunt cerebrovascular injuries"
      },
      "formula": "denver_bcvi",
      "formula_expression": "screen positive iff any published sign (arterial hemorrhage, cervical bruit age <50, expanding cervical hematoma, focal neurologic deficit, neurologic exam incongruous with head CT, or stroke on secondary CT) or any published high-energy risk factor (LeFort II or III, C-spine subluxation or transverse-foramen or C1-C3 fracture, basilar skull fracture with carotid canal, DAI with GCS <6, or near hanging with anoxic brain injury); imaging indicated when screen positive",
      "criteria": [
        {
          "factor": "arterial_hemorrhage",
          "met": false
        },
        {
          "factor": "cervical_bruit_age_lt_50",
          "met": false
        },
        {
          "factor": "expanding_cervical_hematoma",
          "met": false
        },
        {
          "factor": "focal_neuro_deficit",
          "met": false
        },
        {
          "factor": "neuro_exam_incongruous_head_ct",
          "met": false
        },
        {
          "factor": "stroke_on_secondary_ct",
          "met": false
        },
        {
          "factor": "lefort_ii_or_iii",
          "met": false
        },
        {
          "factor": "cspine_subluxation_transverse_foramen_or_c1_c3",
          "met": false
        },
        {
          "factor": "basilar_skull_fracture_carotid_canal",
          "met": false
        },
        {
          "factor": "dai_gcs_lt_6",
          "met": false
        },
        {
          "factor": "near_hanging_anoxic_brain_injury",
          "met": false
        }
      ],
      "screen_positive": false,
      "imaging_indicated": false,
      "risk_factor_positive": false,
      "sign_positive": false
    },
    {
      "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": "Cothren CC, Moore EE",
        "doi": "10.1590/S1807-59322005000600011",
        "id": "cothren-2005",
        "pmid": "16358138",
        "source": "Clinics (Sao Paulo). 2005;60(6):489-496",
        "title": "Blunt cerebrovascular injuries"
      },
      "formula": "denver_bcvi",
      "formula_expression": "screen positive iff any published sign (arterial hemorrhage, cervical bruit age <50, expanding cervical hematoma, focal neurologic deficit, neurologic exam incongruous with head CT, or stroke on secondary CT) or any published high-energy risk factor (LeFort II or III, C-spine subluxation or transverse-foramen or C1-C3 fracture, basilar skull fracture with carotid canal, DAI with GCS <6, or near hanging with anoxic brain injury); imaging indicated when screen positive",
      "criteria": [
        {
          "factor": "arterial_hemorrhage",
          "met": false
        },
        {
          "factor": "cervical_bruit_age_lt_50",
          "met": false
        },
        {
          "factor": "expanding_cervical_hematoma",
          "met": false
        },
        {
          "factor": "focal_neuro_deficit",
          "met": false
        },
        {
          "factor": "neuro_exam_incongruous_head_ct",
          "met": false
        },
        {
          "factor": "stroke_on_secondary_ct",
          "met": false
        },
        {
          "factor": "lefort_ii_or_iii",
          "met": false
        },
        {
          "factor": "cspine_subluxation_transverse_foramen_or_c1_c3",
          "met": false
        },
        {
          "factor": "basilar_skull_fracture_carotid_canal",
          "met": false
        },
        {
          "factor": "dai_gcs_lt_6",
          "met": false
        },
        {
          "factor": "near_hanging_anoxic_brain_injury",
          "met": false
        }
      ],
      "screen_positive": false,
      "imaging_indicated": false,
      "risk_factor_positive": false,
      "sign_positive": false
    }
  ]
}

Response

Field Type Description
formula string denver_bcvi
formula_expression string Cothren 2005 Table 1 any published sign or high-energy risk factor
screen_positive boolean true when any published Cothren 2005 Table 1 sign or high-energy risk factor is present. Imaging is indicated by this screen when true. Not a diagnosis. Not a Biffl grade.
imaging_indicated boolean true when screen_positive is true. magent does not read a CT angiogram and does not assign Biffl grade I-V.
sign_positive boolean true when any of the six published Table 1 signs is present
risk_factor_positive boolean true when any of the five published Table 1 high-energy risk factors is present
criteria array Per-factor rows with factor and met; met is true when that Cothren 2005 Table 1 indication is present
citation object Cothren 2005 Clinics citation
disclaimer string Not-a-device notice

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": "Cothren CC, Moore EE",
    "doi": "10.1590/S1807-59322005000600011",
    "id": "cothren-2005",
    "pmid": "16358138",
    "source": "Clinics (Sao Paulo). 2005;60(6):489-496",
    "title": "Blunt cerebrovascular injuries"
  },
  "formula": "denver_bcvi",
  "formula_expression": "screen positive iff any published sign (arterial hemorrhage, cervical bruit age <50, expanding cervical hematoma, focal neurologic deficit, neurologic exam incongruous with head CT, or stroke on secondary CT) or any published high-energy risk factor (LeFort II or III, C-spine subluxation or transverse-foramen or C1-C3 fracture, basilar skull fracture with carotid canal, DAI with GCS <6, or near hanging with anoxic brain injury); imaging indicated when screen positive",
  "criteria": [
    {
      "factor": "arterial_hemorrhage",
      "met": false
    },
    {
      "factor": "cervical_bruit_age_lt_50",
      "met": false
    },
    {
      "factor": "expanding_cervical_hematoma",
      "met": false
    },
    {
      "factor": "focal_neuro_deficit",
      "met": false
    },
    {
      "factor": "neuro_exam_incongruous_head_ct",
      "met": false
    },
    {
      "factor": "stroke_on_secondary_ct",
      "met": false
    },
    {
      "factor": "lefort_ii_or_iii",
      "met": false
    },
    {
      "factor": "cspine_subluxation_transverse_foramen_or_c1_c3",
      "met": false
    },
    {
      "factor": "basilar_skull_fracture_carotid_canal",
      "met": false
    },
    {
      "factor": "dai_gcs_lt_6",
      "met": false
    },
    {
      "factor": "near_hanging_anoxic_brain_injury",
      "met": false
    }
  ],
  "screen_positive": false,
  "imaging_indicated": false,
  "risk_factor_positive": false,
  "sign_positive": false
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_denver_bcvi Modified Denver BCVI screening needs the published mechanism and sign flags from the cited trauma paper. 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

  • NEXUS C-spine — Apply the Hoffman 2000 NEXUS C-spine rule and return whether the five low-risk criteria all hold (imaging not indicated by this rule).
  • Canadian C-spine rule — Apply the Stiell 2001 Canadian C-spine rule and return whether cervical radiography is indicated from caller-assigned age, high-risk factors, low-risk factors, and neck rotation.

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.