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qSOFA

Compute the Sepsis-3 qSOFA score from respiratory rate, caller-assigned altered mentation, and systolic blood pressure.

Also searched as

qSOFA score
quick SOFA
Sepsis-3 qSOFA
Seymour qSOFA
quick Sequential Organ Failure Assessment

LIVE $0.005 USDC GET /api/calc/qsofa

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

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

What it computes

Compute the Sepsis-3 qSOFA score from respiratory rate, caller-assigned altered mentation, and systolic blood pressure.

When to use

When an agent needs the published three-point qSOFA total and must not invent the criteria or treat the total as a sepsis diagnosis.

When not to use

Not a diagnosis of sepsis and not a treatment recommendation.
Altered mentation is caller-assigned. magent does not compute GCS here.
Thresholds are respiratory rate ≥22, systolic BP ≤100 mm Hg, and altered mentation as in Seymour 2016.

Formula

qSOFA = respiratory_rate_ge_22 + altered_mentation + systolic_mm_hg_le_100; each 1 if present; max 3

Citation

Title: Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)
Authors: Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A, Rubenfeld G, Kahn JM, Shankar-Hari M, Singer M, Deutschman CS, Escobar GJ, Angus DC
Source: JAMA. 2016;315(8):762-774
DOI: 10.1001/jama.2016.0288

Worked example

All criteria absent

Given: altered_mentation=falserespiratory_rate=16systolic_mm_hg=120

Respiratory rate 16 < 22 → 0; mentation false → 0; SBP 120 > 100 → 0
Score = 0 (max 3)

All three present

Given: altered_mentation=truerespiratory_rate=22systolic_mm_hg=100

Respiratory rate ≥22 → 1; mentation true → 1; SBP ≤100 → 1
Score = 3 (max 3)

Try

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

/api/calc/qsofa?respiratory_rate=16&systolic_mm_hg=120&altered_mentation=false

Full URL: https://api.magentlab.com/api/calc/qsofa?respiratory_rate=16&systolic_mm_hg=120&altered_mentation=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/qsofa?respiratory_rate=16&systolic_mm_hg=120&altered_mentation=false"

Parameters

Name	Type	Required	Description
`respiratory_rate`	integer	required	Respiratory rate in breaths/min (integer 4-80). ≥22 scores 1.
`systolic_mm_hg`	number	required	Systolic blood pressure in mm Hg (50-250). ≤100 scores 1.
`altered_mentation`	boolean	required	Altered mentation as assigned by the caller (GCS <15 in Seymour 2016). true or false. magent does not compute GCS here.

Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

POST /api/calc/qsofa Max 25 unit_amount * n PREVIEW

1 to 25 items. Each item uses the same keys as the GET query parameters.
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": [
    {
      "altered_mentation": "false",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    },
    {
      "altered_mentation": "false",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    }
  ]
}

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/qsofa",
  "items": [
    {
      "components": [
        {
          "value": 16,
          "factor": "respiratory_rate_ge_22",
          "points": 0,
          "present": false
        },
        {
          "factor": "altered_mentation",
          "points": 0,
          "present": false
        },
        {
          "value": 120.0,
          "factor": "systolic_mm_hg_le_100",
          "points": 0,
          "present": 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": "Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A, Rubenfeld G, Kahn JM, Shankar-Hari M, Singer M, Deutschman CS, Escobar GJ, Angus DC",
        "doi": "10.1001/jama.2016.0288",
        "id": "seymour-2016",
        "source": "JAMA. 2016;315(8):762-774",
        "title": "Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)"
      },
      "formula": "qsofa",
      "formula_expression": "qSOFA = respiratory_rate_ge_22 + altered_mentation + systolic_mm_hg_le_100; each 1 if present; max 3",
      "max_score": 3,
      "score": 0
    },
    {
      "components": [
        {
          "value": 16,
          "factor": "respiratory_rate_ge_22",
          "points": 0,
          "present": false
        },
        {
          "factor": "altered_mentation",
          "points": 0,
          "present": false
        },
        {
          "value": 120.0,
          "factor": "systolic_mm_hg_le_100",
          "points": 0,
          "present": 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": "Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A, Rubenfeld G, Kahn JM, Shankar-Hari M, Singer M, Deutschman CS, Escobar GJ, Angus DC",
        "doi": "10.1001/jama.2016.0288",
        "id": "seymour-2016",
        "source": "JAMA. 2016;315(8):762-774",
        "title": "Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)"
      },
      "formula": "qsofa",
      "formula_expression": "qSOFA = respiratory_rate_ge_22 + altered_mentation + systolic_mm_hg_le_100; each 1 if present; max 3",
      "max_score": 3,
      "score": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	qsofa
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-3
`max_score`	integer	Always 3
`components`	array	Per-criterion points
`citation`	object	Seymour 2016 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 16,
      "factor": "respiratory_rate_ge_22",
      "points": 0,
      "present": false
    },
    {
      "factor": "altered_mentation",
      "points": 0,
      "present": false
    },
    {
      "value": 120.0,
      "factor": "systolic_mm_hg_le_100",
      "points": 0,
      "present": 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": "Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A, Rubenfeld G, Kahn JM, Shankar-Hari M, Singer M, Deutschman CS, Escobar GJ, Angus DC",
    "doi": "10.1001/jama.2016.0288",
    "id": "seymour-2016",
    "source": "JAMA. 2016;315(8):762-774",
    "title": "Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)"
  },
  "formula": "qsofa",
  "formula_expression": "qSOFA = respiratory_rate_ge_22 + altered_mentation + systolic_mm_hg_le_100; each 1 if present; max 3",
  "max_score": 3,
  "score": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_respiratory_rate`	respiratory_rate must be an integer from 4 to 80. Returned before settlement; you are not charged.
400	`invalid_systolic_bp`	systolic_mm_hg or systolic_bp_mm_hg must be a number from 50 to 250. 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

SOFA — Compute the Vincent 1996 SOFA score from PaO2/FiO2, platelets, bilirubin, MAP and adrenergic agents, GCS, and creatinine or urine output.

Payment

Required query parameters must be present and valid. 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

Invalid query parameters return HTTP 400 before settlement. You are not charged.
Settlement finishes before the tool executes (paymentFlow upfront). 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.