Respiratory · LIVE

ARDSNet 6 mL/kg tidal volume

ARDSNet tidal volume

Compute ARDS Network 2000 predicted body weight from height and sex and the lower-tidal-volume arm of 6 mL/kg PBW.

LIVE $0.005 USDC GET /api/calc/ardsnet_tv

Markdown: /docs/ardsnet-tv.md · Canonical: https://magentlab.com/docs/ardsnet-tv

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

What it computes

Compute ARDS Network 2000 predicted body weight from height and sex and the lower-tidal-volume arm of 6 mL/kg PBW.

When to use

When an agent needs the published ARDSNet PBW and 6 mL/kg tidal volume and must not invent adult ETT insertion depth, a Devine IBW kilogram, or a plateau-pressure titration.

When not to use

• Not a medical device. Not a ventilator order. magent does not set mode, PEEP, or FiO2.
• Plateau-pressure titration (4–8 mL/kg, Pplat ≤30 cm H2O) is not computed; this tool returns 6 mL/kg PBW and the published 4 mL/kg minimum only. The traditional 12 mL/kg arm is not computed.
• Not AECC or Berlin ARDS diagnosis (see berlin-ards). Not pediatric endotracheal tube size (see pediatric-ett). magent does not predict ETT insertion depth.
• ARDSNet predicted body weight from the 2000 trial, not Devine gentamicin ideal body weight (see ibw).

Formula

PBW_kg = 50 + 0.91 * (height_cm - 152.4) (male); PBW_kg = 45.5 + 0.91 * (height_cm - 152.4) (female); tidal_volume_6_ml = 6 * PBW_kg; tidal_volume_4_ml = 4 * PBW_kg

Citation

Title

Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome

Authors

The Acute Respiratory Distress Syndrome Network

Source

N Engl J Med. 2000;342(18):1301-1308

DOI

10.1056/NEJM200005043421801

Worked example

Also searched as

• ARDSNet tidal volume
• 6 mL/kg PBW
• predicted body weight ventilation
• lower tidal volume ARDS
• ARDS Network 6 ml/kg
• PBW tidal volume
• ARDSNet predicted body weight

Try

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

/api/calc/ardsnet_tv?sex=male&height_cm=170

Full URL: https://api.magentlab.com/api/calc/ardsnet_tv?sex=male&height_cm=170

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/ardsnet_tv?sex=male&height_cm=170"

Parameters

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/ardsnet_tv 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": [
    {
      "height_cm": "170",
      "sex": "male"
    },
    {
      "height_cm": "170",
      "sex": "male"
    }
  ]
}

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/ardsnet_tv",
  "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": "The Acute Respiratory Distress Syndrome Network",
        "doi": "10.1056/NEJM200005043421801",
        "id": "ardsnet-2000",
        "pmid": "10793162",
        "source": "N Engl J Med. 2000;342(18):1301-1308",
        "title": "Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome"
      },
      "formula": "ardsnet_tv",
      "formula_expression": "PBW_kg = 50 + 0.91 * (height_cm - 152.4) (male); PBW_kg = 45.5 + 0.91 * (height_cm - 152.4) (female); tidal_volume_6_ml = 6 * PBW_kg; tidal_volume_4_ml = 4 * PBW_kg",
      "sex": "male",
      "height_cm": 170.0,
      "pbw_kg": 66.0,
      "tidal_volume_4_ml": 264.0,
      "tidal_volume_6_ml": 396.0
    },
    {
      "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": "The Acute Respiratory Distress Syndrome Network",
        "doi": "10.1056/NEJM200005043421801",
        "id": "ardsnet-2000",
        "pmid": "10793162",
        "source": "N Engl J Med. 2000;342(18):1301-1308",
        "title": "Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome"
      },
      "formula": "ardsnet_tv",
      "formula_expression": "PBW_kg = 50 + 0.91 * (height_cm - 152.4) (male); PBW_kg = 45.5 + 0.91 * (height_cm - 152.4) (female); tidal_volume_6_ml = 6 * PBW_kg; tidal_volume_4_ml = 4 * PBW_kg",
      "sex": "male",
      "height_cm": 170.0,
      "pbw_kg": 66.0,
      "tidal_volume_4_ml": 264.0,
      "tidal_volume_6_ml": 396.0
    }
  ]
}

Response

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": "The Acute Respiratory Distress Syndrome Network",
    "doi": "10.1056/NEJM200005043421801",
    "id": "ardsnet-2000",
    "pmid": "10793162",
    "source": "N Engl J Med. 2000;342(18):1301-1308",
    "title": "Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome"
  },
  "formula": "ardsnet_tv",
  "formula_expression": "PBW_kg = 50 + 0.91 * (height_cm - 152.4) (male); PBW_kg = 45.5 + 0.91 * (height_cm - 152.4) (female); tidal_volume_6_ml = 6 * PBW_kg; tidal_volume_4_ml = 4 * PBW_kg",
  "sex": "male",
  "height_cm": 170.0,
  "pbw_kg": 66.0,
  "tidal_volume_4_ml": 264.0,
  "tidal_volume_6_ml": 396.0
}

Client errors (HTTP 400)

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

Related tools

• Berlin Definition of ARDS — Apply the 2012 Berlin Definition of ARDS and return whether the clinical box holds, severity (none, mild, moderate, or severe), and berlin_ards.
• Devine IBW — Compute Devine ideal body weight and 0.4 adjusted body weight from height, sex, and actual weight.
• Pediatric ETT size — Compute Cole 1957 uncuffed pediatric endotracheal tube internal diameter from age in years.

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.