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ABCD2 score

Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes.

Also searched as

ABCD2 score
ABCD2 TIA score
Johnston ABCD2
TIA stroke risk score
ABCD 2
transient ischaemic attack ABCD2
very early stroke risk after TIA

LIVE $0.005 USDC GET /api/calc/abcd2

Markdown: /docs/abcd2.md · Canonical: https://magentlab.com/docs/abcd2

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

What it computes

Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes.

When to use

When an agent needs the published Johnston 2007 ABCD2 total and must not invent clinical_features from a chart narrative.

When not to use

Not a diagnosis or admit protocol. magent does not diagnose TIA.
This is ABCD2 (Johnston 2007), not ABCD (Rothwell 2005 only) and not ABCD3-I.
clinical_features is a caller-assigned enum (none, speech_without_weakness, or unilateral_weakness). magent does not examine the patient.

Formula

ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7

Citation

Title: Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack
Authors: Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al.
Source: Lancet. 2007;369(9558):283-292
DOI: 10.1016/S0140-6736(07)60150-0

Worked example

Age 55, normal BP, no features, 5 minutes, no diabetes

Given: age=55clinical_features=nonediabetes=falsediastolic_mm_hg=80duration_min=5systolic_mm_hg=120

Age 55 (<60) → 0; BP 120/80 → 0; clinical none → 0; duration 5 → 0; diabetes false → 0
Score = 0; band 0-3

Try

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

/api/calc/abcd2?age=55&systolic_mm_hg=120&diastolic_mm_hg=80&clinical_features=none&duration_min=5&diabetes=false

Full URL: https://api.magentlab.com/api/calc/abcd2?age=55&systolic_mm_hg=120&diastolic_mm_hg=80&clinical_features=none&duration_min=5&diabetes=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/abcd2?age=55&systolic_mm_hg=120&diastolic_mm_hg=80&clinical_features=none&duration_min=5&diabetes=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). Age ≥60 scores 1; 59 scores 0.
`systolic_mm_hg`	number	required	Cuff systolic blood pressure in mm Hg (50-250). ≥140 scores 1.
`diastolic_mm_hg`	number	required	Cuff diastolic blood pressure in mm Hg (20-160). Must be less than systolic. ≥90 scores 1.
`clinical_features`	string	required	Caller-assigned TIA features. none scores 0; speech_without_weakness scores 1; unilateral_weakness scores 2. Mutually exclusive. magent does not examine the patient.
`duration_min`	integer	required	Symptom duration in minutes (integer 0-1440). Under 10 scores 0; 10-59 scores 1; 60 or more scores 2.
`diabetes`	boolean	required	Diabetes mellitus. true scores 1; false scores 0.

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/abcd2 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": "55",
      "clinical_features": "none",
      "diabetes": "false",
      "diastolic_mm_hg": "80",
      "duration_min": "5",
      "systolic_mm_hg": "120"
    },
    {
      "age": "55",
      "clinical_features": "none",
      "diabetes": "false",
      "diastolic_mm_hg": "80",
      "duration_min": "5",
      "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/abcd2",
  "items": [
    {
      "components": [
        {
          "value": 55,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "blood_pressure",
          "points": 0,
          "diastolic_mm_hg": 80.0,
          "systolic_mm_hg": 120.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "clinical_features",
          "points": 0,
          "present": false
        },
        {
          "value": 5,
          "factor": "duration_min",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "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": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al.",
        "doi": "10.1016/S0140-6736(07)60150-0",
        "id": "johnston-2007",
        "source": "Lancet. 2007;369(9558):283-292",
        "title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack"
      },
      "formula": "abcd2",
      "formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7",
      "max_score": 7,
      "score": 0,
      "abcd2_band": "0-3",
      "age_years": 55
    },
    {
      "components": [
        {
          "value": 55,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "blood_pressure",
          "points": 0,
          "diastolic_mm_hg": 80.0,
          "systolic_mm_hg": 120.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "clinical_features",
          "points": 0,
          "present": false
        },
        {
          "value": 5,
          "factor": "duration_min",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "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": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al.",
        "doi": "10.1016/S0140-6736(07)60150-0",
        "id": "johnston-2007",
        "source": "Lancet. 2007;369(9558):283-292",
        "title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack"
      },
      "formula": "abcd2",
      "formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7",
      "max_score": 7,
      "score": 0,
      "abcd2_band": "0-3",
      "age_years": 55
    }
  ]
}

Response

Field	Type	Description
`formula`	string	abcd2
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-7
`max_score`	integer	Always 7
`abcd2_band`	string	0-3, 4-5, or 6-7 (Johnston 2007)
`age_years`	integer	Age used for the ≥60 criterion
`components`	array	Per-factor points
`citation`	object	Johnston 2007 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 55,
      "factor": "age",
      "points": 0,
      "present": false
    },
    {
      "factor": "blood_pressure",
      "points": 0,
      "diastolic_mm_hg": 80.0,
      "systolic_mm_hg": 120.0,
      "present": false
    },
    {
      "value": "none",
      "factor": "clinical_features",
      "points": 0,
      "present": false
    },
    {
      "value": 5,
      "factor": "duration_min",
      "points": 0,
      "present": false
    },
    {
      "factor": "diabetes",
      "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": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al.",
    "doi": "10.1016/S0140-6736(07)60150-0",
    "id": "johnston-2007",
    "source": "Lancet. 2007;369(9558):283-292",
    "title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack"
  },
  "formula": "abcd2",
  "formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7",
  "max_score": 7,
  "score": 0,
  "abcd2_band": "0-3",
  "age_years": 55
}

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_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_diastolic_bp`	diastolic_mm_hg must be a number from 20 to 160. Returned before settlement; you are not charged.
400	`invalid_pulse_pressure`	diastolic_mm_hg must be less than systolic_mm_hg. Returned before settlement; you are not charged.
400	`invalid_abcd2_clinical`	clinical_features must be none, speech_without_weakness, or unilateral_weakness. Returned before settlement; you are not charged.
400	`invalid_duration_min`	duration_min must be an integer from 0 to 1440. 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

Glasgow Coma Scale — Compute the Glasgow Coma Scale as the sum of caller-assigned eye, verbal, and motor integers. The 1974 or 1976 edition is required.

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.