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Pre-endoscopy Rockall

Compute the Rockall 1996 pre-endoscopy (admission) score from age, heart rate, systolic blood pressure, and caller-assigned comorbidity after acute upper gastrointestinal haemorrhage.

LIVE $0.005 USDC GET /api/calc/rockall_pre

Markdown: /docs/rockall-pre.md · Canonical: https://magentlab.com/docs/rockall-pre

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

What it computes

Compute the Rockall 1996 pre-endoscopy (admission) score from age, heart rate, systolic blood pressure, and caller-assigned comorbidity after acute upper gastrointestinal haemorrhage.

When to use

When an agent needs the published pre-endoscopy Rockall score (age + shock + comorbidity only) and must not apply complete/post-endoscopy Rockall, AIMS65, or Glasgow-Blatchford.

When not to use

Not a diagnosis of the cause or severity of bleeding.
Not complete or post-endoscopy Rockall. This tool is the admission/pre-endoscopy score only (age, shock, and comorbidity). Diagnosis and stigmata of recent haemorrhage are not inputs.
Not AIMS65 and not the Glasgow-Blatchford score.
magent does not assign comorbidity. The caller maps cardiac failure, IHD, or any major comorbidity to cardiac, and renal failure, liver failure, or disseminated malignancy to renal_liver_metastatic.

Formula

pre-endoscopy Rockall = age (<60: 0, 60-79: 1, >=80: 2) + shock (SBP<100: 2; else HR>=100: 1; else 0) + comorbidity (none: 0, cardiac: 2, renal_liver_metastatic: 3); max 7

Citation

Title: Risk assessment after acute upper gastrointestinal haemorrhage
Authors: Rockall TA, Logan RF, Devlin HB, Northfield TC
Source: Gut. 1996;38(3):316-321
DOI: 10.1136/gut.38.3.316

Worked example

Age 50, no shock, no comorbidity

Given: age=50comorbidity=noneheart_rate_bpm=80systolic_mm_hg=120

Age 50 is <60 → 0; HR 80 with SBP 120 is not tachycardia or hypotension → 0; comorbidity none → 0
Score = 0 (max 7)

Age 80, hypotension, renal/liver/metastatic (max 7)

Given: age=80comorbidity=renal_liver_metastaticheart_rate_bpm=60systolic_mm_hg=99

Age 80 ≥ 80 → 2; SBP 99 < 100 → 2 (hypotension; tachycardia not added); renal_liver_metastatic → 3
Score = 7 (max 7)

Also searched as

pre-endoscopy Rockall
admission Rockall score
Rockall 1996
clinical Rockall
pre endoscopy Rockall
Rockall GI bleed score

Try

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

/api/calc/rockall_pre?age=50&heart_rate_bpm=80&systolic_mm_hg=120&comorbidity=none

Full URL: https://api.magentlab.com/api/calc/rockall_pre?age=50&heart_rate_bpm=80&systolic_mm_hg=120&comorbidity=none

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/rockall_pre?age=50&heart_rate_bpm=80&systolic_mm_hg=120&comorbidity=none"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). <60 scores 0; 60-79 scores 1; ≥80 scores 2. 59 does not score; 60 scores 1; 79 scores 1; 80 scores 2.
`heart_rate_bpm`	integer	required	Heart rate in beats per minute (integer 30-220). With SBP ≥100, HR ≥100 scores 1 (tachycardia); 99 does not. Not added when SBP <100.
`systolic_mm_hg`	number	required	Systolic blood pressure in mm Hg (50-250). SBP <100 scores 2 (hypotension) and tachycardia is not added; 100 does not score hypotension.
`comorbidity`	string	required	Caller-assigned comorbidity: none (0), cardiac (2; cardiac failure, IHD, or any major comorbidity), or renal_liver_metastatic (3; renal failure, liver failure, or disseminated malignancy). magent does not assign comorbidity.

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/rockall_pre 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": [
    {
      "age": "50",
      "comorbidity": "none",
      "heart_rate_bpm": "80",
      "systolic_mm_hg": "120"
    },
    {
      "age": "50",
      "comorbidity": "none",
      "heart_rate_bpm": "80",
      "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/rockall_pre",
  "items": [
    {
      "components": [
        {
          "value": 50,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "value": {
            "systolic_mm_hg": 120.0,
            "heart_rate_bpm": 80
          },
          "factor": "shock",
          "points": 0,
          "present": false
        },
        {
          "value": "none",
          "factor": "comorbidity",
          "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": "Rockall TA, Logan RF, Devlin HB, Northfield TC",
        "doi": "10.1136/gut.38.3.316",
        "id": "rockall-1996",
        "source": "Gut. 1996;38(3):316-321",
        "title": "Risk assessment after acute upper gastrointestinal haemorrhage"
      },
      "formula": "rockall_pre",
      "formula_expression": "pre-endoscopy Rockall = age (<60: 0, 60-79: 1, >=80: 2) + shock (SBP<100: 2; else HR>=100: 1; else 0) + comorbidity (none: 0, cardiac: 2, renal_liver_metastatic: 3); max 7",
      "max_score": 7,
      "score": 0,
      "age_years": 50,
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "comorbidity": "none"
    },
    {
      "components": [
        {
          "value": 50,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "value": {
            "systolic_mm_hg": 120.0,
            "heart_rate_bpm": 80
          },
          "factor": "shock",
          "points": 0,
          "present": false
        },
        {
          "value": "none",
          "factor": "comorbidity",
          "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": "Rockall TA, Logan RF, Devlin HB, Northfield TC",
        "doi": "10.1136/gut.38.3.316",
        "id": "rockall-1996",
        "source": "Gut. 1996;38(3):316-321",
        "title": "Risk assessment after acute upper gastrointestinal haemorrhage"
      },
      "formula": "rockall_pre",
      "formula_expression": "pre-endoscopy Rockall = age (<60: 0, 60-79: 1, >=80: 2) + shock (SBP<100: 2; else HR>=100: 1; else 0) + comorbidity (none: 0, cardiac: 2, renal_liver_metastatic: 3); max 7",
      "max_score": 7,
      "score": 0,
      "age_years": 50,
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "comorbidity": "none"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	rockall_pre
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-7
`max_score`	integer	Always 7
`age_years`	integer	Age used for the age band
`heart_rate_bpm`	integer	Heart rate used, bpm
`systolic_mm_hg`	number	Systolic pressure used, mm Hg
`comorbidity`	string	none, cardiac, or renal_liver_metastatic as supplied by the caller
`components`	array	Age, shock, and comorbidity points
`citation`	object	Rockall 1996 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 50,
      "factor": "age",
      "points": 0,
      "present": false
    },
    {
      "value": {
        "systolic_mm_hg": 120.0,
        "heart_rate_bpm": 80
      },
      "factor": "shock",
      "points": 0,
      "present": false
    },
    {
      "value": "none",
      "factor": "comorbidity",
      "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": "Rockall TA, Logan RF, Devlin HB, Northfield TC",
    "doi": "10.1136/gut.38.3.316",
    "id": "rockall-1996",
    "source": "Gut. 1996;38(3):316-321",
    "title": "Risk assessment after acute upper gastrointestinal haemorrhage"
  },
  "formula": "rockall_pre",
  "formula_expression": "pre-endoscopy Rockall = age (<60: 0, 60-79: 1, >=80: 2) + shock (SBP<100: 2; else HR>=100: 1; else 0) + comorbidity (none: 0, cardiac: 2, renal_liver_metastatic: 3); max 7",
  "max_score": 7,
  "score": 0,
  "age_years": 50,
  "systolic_mm_hg": 120.0,
  "heart_rate_bpm": 80,
  "comorbidity": "none"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_age`	age must be an integer from 18 to 120 Returned before settlement; you are not charged.
400	`invalid_heart_rate`	heart_rate_bpm must be an integer from 30 to 220 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_rockall_comorbidity`	comorbidity must be none, cardiac, or renal_liver_metastatic. 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

Glasgow-Blatchford score — Compute the Blatchford 2000 Glasgow-Blatchford score from urea, haemoglobin, systolic BP, heart rate, and four clinical flags.

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.