Atrial fibrillation · LIVE

ORBIT bleeding score

Compute the O'Brien 2015 ORBIT bleeding score from age and caller-assigned anemia, bleeding history, insufficient kidney, and antiplatelet flags.

LIVE $0.005 USDC GET /api/calc/orbit

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

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

What it computes

Compute the O'Brien 2015 ORBIT bleeding score from age and caller-assigned anemia, bleeding history, insufficient kidney, and antiplatelet flags.

When to use

When an agent needs the published ORBIT AF bleeding-risk arithmetic (not HAS-BLED) and must not invent the point total from prose.

When not to use

Not a diagnosis. magent does not diagnose bleeding or atrial fibrillation.
Not HAS-BLED. This tool is the O'Brien 2015 ORBIT bleeding score only.
Not a treatment or anticoagulation recommendation.
magent does not take hemoglobin or compute eGFR. Anemia and insufficient kidney (paper eGFR <60) are caller flags.

Formula

ORBIT = age_ge_75 (1) + anemia (2) + bleeding_history (2) + insufficient_kidney (1) + antiplatelet (1); max 7; 0-2 low, 3 intermediate, >=4 high

Citation

Title: The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation
Authors: O'Brien EC, Simon DN, Thomas LE, et al.
Source: Eur Heart J. 2015;36(46):3258-3264
DOI: 10.1093/eurheartj/ehv182

Worked example

Age 70, all flags false

Given: age=70anemia=falseantiplatelet=falsebleeding_history=falseinsufficient_kidney=false

Age 70 is not ≥75 → 0; anemia, bleeding history, insufficient kidney, and antiplatelet false → 0
Score = 0 (max 7); orbit_risk low

Age 75 plus anemia is intermediate

Given: age=75anemia=trueantiplatelet=falsebleeding_history=falseinsufficient_kidney=false

Age 75 ≥ 75 → 1; anemia → 2
Score = 3 (max 7); orbit_risk intermediate

Also searched as

ORBIT score
ORBIT bleeding score
O'Brien bleeding score
AF ORBIT score
ORBIT AF bleed

Try

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

/api/calc/orbit?age=70&anemia=false&bleeding_history=false&insufficient_kidney=false&antiplatelet=false

Full URL: https://api.magentlab.com/api/calc/orbit?age=70&anemia=false&bleeding_history=false&insufficient_kidney=false&antiplatelet=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/orbit?age=70&anemia=false&bleeding_history=false&insufficient_kidney=false&antiplatelet=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). ≥75 scores 1 (75 scores; 74 does not).
`anemia`	boolean	required	Anemia as assigned by the caller. true or false. Scores 2. magent does not take hemoglobin.
`bleeding_history`	boolean	required	Bleeding history as assigned by the caller. true or false. Scores 2.
`insufficient_kidney`	boolean	required	Insufficient kidney function as assigned by the caller (paper eGFR <60). true or false. Scores 1. magent does not compute eGFR.
`antiplatelet`	boolean	required	Antiplatelet therapy as assigned by the caller. true or false. Scores 1.

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/orbit 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": [
    {
      "age": "70",
      "anemia": "false",
      "antiplatelet": "false",
      "bleeding_history": "false",
      "insufficient_kidney": "false"
    },
    {
      "age": "70",
      "anemia": "false",
      "antiplatelet": "false",
      "bleeding_history": "false",
      "insufficient_kidney": "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/orbit",
  "items": [
    {
      "components": [
        {
          "value": 70,
          "factor": "age_ge_75",
          "points": 0,
          "present": false
        },
        {
          "factor": "anemia",
          "points": 0,
          "present": false
        },
        {
          "factor": "bleeding_history",
          "points": 0,
          "present": false
        },
        {
          "factor": "insufficient_kidney",
          "points": 0,
          "present": false
        },
        {
          "factor": "antiplatelet",
          "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.",
      "age_years": 70,
      "citation": {
        "authors": "O'Brien EC, Simon DN, Thomas LE, et al.",
        "doi": "10.1093/eurheartj/ehv182",
        "id": "obrien-2015",
        "source": "Eur Heart J. 2015;36(46):3258-3264",
        "title": "The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation"
      },
      "formula": "orbit",
      "formula_expression": "ORBIT = age_ge_75 (1) + anemia (2) + bleeding_history (2) + insufficient_kidney (1) + antiplatelet (1); max 7; 0-2 low, 3 intermediate, >=4 high",
      "max_score": 7,
      "score": 0,
      "orbit_risk": "low"
    },
    {
      "components": [
        {
          "value": 70,
          "factor": "age_ge_75",
          "points": 0,
          "present": false
        },
        {
          "factor": "anemia",
          "points": 0,
          "present": false
        },
        {
          "factor": "bleeding_history",
          "points": 0,
          "present": false
        },
        {
          "factor": "insufficient_kidney",
          "points": 0,
          "present": false
        },
        {
          "factor": "antiplatelet",
          "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.",
      "age_years": 70,
      "citation": {
        "authors": "O'Brien EC, Simon DN, Thomas LE, et al.",
        "doi": "10.1093/eurheartj/ehv182",
        "id": "obrien-2015",
        "source": "Eur Heart J. 2015;36(46):3258-3264",
        "title": "The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation"
      },
      "formula": "orbit",
      "formula_expression": "ORBIT = age_ge_75 (1) + anemia (2) + bleeding_history (2) + insufficient_kidney (1) + antiplatelet (1); max 7; 0-2 low, 3 intermediate, >=4 high",
      "max_score": 7,
      "score": 0,
      "orbit_risk": "low"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	orbit
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-7
`max_score`	integer	Always 7
`orbit_risk`	string	low when score is 0-2; intermediate when 3; high when ≥4. Not a diagnosis.
`age_years`	integer	Age used for the ≥75 criterion
`components`	array	Per-factor points
`citation`	object	O'Brien 2015 Eur Heart J citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 70,
      "factor": "age_ge_75",
      "points": 0,
      "present": false
    },
    {
      "factor": "anemia",
      "points": 0,
      "present": false
    },
    {
      "factor": "bleeding_history",
      "points": 0,
      "present": false
    },
    {
      "factor": "insufficient_kidney",
      "points": 0,
      "present": false
    },
    {
      "factor": "antiplatelet",
      "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.",
  "age_years": 70,
  "citation": {
    "authors": "O'Brien EC, Simon DN, Thomas LE, et al.",
    "doi": "10.1093/eurheartj/ehv182",
    "id": "obrien-2015",
    "source": "Eur Heart J. 2015;36(46):3258-3264",
    "title": "The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation"
  },
  "formula": "orbit",
  "formula_expression": "ORBIT = age_ge_75 (1) + anemia (2) + bleeding_history (2) + insufficient_kidney (1) + antiplatelet (1); max 7; 0-2 low, 3 intermediate, >=4 high",
  "max_score": 7,
  "score": 0,
  "orbit_risk": "low"
}

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_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

HAS-BLED — Compute the HAS-BLED bleeding-risk score from discrete clinical flags.
CHA2DS2-VASc — Compute the CHA2DS2-VASc stroke-risk score from discrete 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.