# ABCD2 score ABCD2 score ## 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 Status: LIVE Price: $0.005 USDC `GET /api/calc/abcd2` HTML: https://magentlab.com/docs/abcd2 Markdown: https://magentlab.com/docs/abcd2.md 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 [Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack](https://doi.org/10.1016/S0140-6736(07)60150-0) Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al. Lancet. 2007;369(9558):283-292 DOI: [10.1016/S0140-6736(07)60150-0](https://doi.org/10.1016/S0140-6736(07)60150-0) ## Worked example ### Age 55, normal BP, no features, 5 minutes, no diabetes Given: `age=55, clinical_features=none, diabetes=false, diastolic_mm_hg=80, duration_min=5, systolic_mm_hg=120` 1. Age 55 (<60) → 0; BP 120/80 → 0; clinical none → 0; duration 5 → 0; diabetes false → 0 2. Score = 0; band 0-3 ## Parameters - `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. Method: `POST /api/calc/abcd2` 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": [ { "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" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/abcd2 Example 200: ```json { "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 fields - `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 Frozen fixture. Not a live lookup. ```json { "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 } ``` ## Errors - HTTP 400 `invalid_age`: age must be an integer from 18 to 120 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_diastolic_bp`: diastolic_mm_hg must be a number from 20 to 160. Returned before settlement; you are not charged. - HTTP 400 `invalid_pulse_pressure`: diastolic_mm_hg must be less than systolic_mm_hg. Returned before settlement; you are not charged. - HTTP 400 `invalid_abcd2_clinical`: clinical_features must be none, speech_without_weakness, or unilateral_weakness. Returned before settlement; you are not charged. - HTTP 400 `invalid_duration_min`: duration_min must be an integer from 0 to 1440. 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 - [Glasgow Coma Scale](https://magentlab.com/docs/gcs) — 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. - 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.