# qSOFA

qSOFA

## Also searched as

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

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/qsofa`
HTML: https://magentlab.com/docs/qsofa
Markdown: https://magentlab.com/docs/qsofa.md

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

[Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)](https://doi.org/10.1001/jama.2016.0288)
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
JAMA. 2016;315(8):762-774
DOI: [10.1001/jama.2016.0288](https://doi.org/10.1001/jama.2016.0288)

## Worked example

### All criteria absent

Given: `altered_mentation=false, respiratory_rate=16, systolic_mm_hg=120`

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


### All three present

Given: `altered_mentation=true, respiratory_rate=22, systolic_mm_hg=100`

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


## Parameters

- `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.

Method: `POST /api/calc/qsofa`
Max items: 25
Price: unit_amount * n (unit 5000 atomic)
Status: 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:

```json
{
  "items": [
    {
      "altered_mentation": "false",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    },
    {
      "altered_mentation": "false",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/qsofa

Example 200:

```json
{
  "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 fields

- `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

Frozen fixture. Not a live lookup.

```json
{
  "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
}
```

## Errors

- HTTP 400 `invalid_respiratory_rate`: respiratory_rate must be an integer from 4 to 80. Returned before settlement; you are not charged.
- HTTP 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.
- 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

- [SOFA](https://magentlab.com/docs/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.

- 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 EIP-3009 (scheme exact, assetTransferMethod eip3009) with validBefore = now + accepts[0].maxTimeoutSeconds (600 seconds). That window starts when you sign and must cover wallet confirmation plus CDP verify and settle. Magent retries transient facilitator 429/5xx before answering. Do not send upto or batch-settlement payloads; magent does not offer those schemes.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON echoing accepted, payload, and extensions when present).
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. Settlement happens before the tool runs. HTTP 503 settlement_uncertain or settle_failed: retry the same PAYMENT-SIGNATURE. Mint a new 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.

- 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.
- not offered `batch-settlement`: Not offered. Payment-channel vouchers claimed later in batches. Not the same as POST {items} bulk (that is still exact).

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for n times the GET unit. 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

- 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.