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DAPT score (Yeh 2016)

DAPT score

Sum the Yeh 2016 DAPT prediction rule after PCI from exclusive age bands and eight caller-assigned flags and return the published high/low band.

LIVE $0.005 USDC GET /api/calc/dapt

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

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

What it computes

Sum the Yeh 2016 DAPT prediction rule after PCI from exclusive age bands and eight caller-assigned flags and return the published high/low band.

When to use

When an agent needs the published Yeh 2016 DAPT point total after PCI and must not invent a dual antiplatelet duration or ischemia/bleeding percents.

When not to use

Not a medical device and not a prescription for dual antiplatelet therapy duration.
Not a diagnosis. magent does not interpret the angiogram or assign MI, stent, smoking, CHF, or LVEF; every flag is caller-assigned.
Age bands are mutually exclusive: younger than 65 scores 0; 65 to younger than 75 scores -1; 75 or older scores -2. Age 75 is -2, not -1.
Score >=2 is the published high band (continued thienopyridine associated with larger ischemic-event reduction); score <2 is low. Does not return ischemia or bleeding percents.

Formula

DAPT = exclusive age (<65: 0, 65 to <75: -1, >=75: -2) + myocardial_infarction_at_presentation 1 + prior_mi_or_pci 1 + diabetes 1 + stent_diameter_lt_3mm 1 + smoking 1 + paclitaxel_eluting_stent 1 + chf_or_lvef_lt_30 2 + vein_graft_intervention 2; max 10; >=2 high, <2 low (Yeh 2016)

Citation

Title: Development and Validation of a Prediction Rule for Benefit and Harm of Dual Antiplatelet Therapy Beyond 1 Year After Percutaneous Coronary Intervention
Authors: Yeh RW, Secemsky EA, Kereiakes DJ, et al
Source: JAMA. 2016;315(16):1735-1749
DOI: 10.1001/jama.2016.3775

Worked example

Age 60, all flags false

Given: age=60chf_or_lvef_lt_30=falsediabetes=falsemyocardial_infarction_at_presentation=falsepaclitaxel_eluting_stent=falseprior_mi_or_pci=falsesmoking=falsestent_diameter_lt_3mm=falsevein_graft_intervention=false

Age 60 is younger than 65 → 0; all flags false → 0
Score = 0 (max 10); risk_band low

Age 60, CHF or LVEF <30%

Given: age=60chf_or_lvef_lt_30=truediabetes=falsemyocardial_infarction_at_presentation=falsepaclitaxel_eluting_stent=falseprior_mi_or_pci=falsesmoking=falsestent_diameter_lt_3mm=falsevein_graft_intervention=false

Age 60 → 0; chf_or_lvef_lt_30 → 2
Score = 2 (max 10); risk_band high

Also searched as

DAPT score
Dual antiplatelet therapy score
Yeh DAPT
DAPT prediction rule
Yeh 2016 DAPT
prolonged DAPT score
DAPT after PCI

Try

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

/api/calc/dapt?age=60&myocardial_infarction_at_presentation=false&prior_mi_or_pci=false&diabetes=false&stent_diameter_lt_3mm=false&smoking=false&paclitaxel_eluting_stent=false&chf_or_lvef_lt_30=false&vein_graft_intervention=false

Full URL: https://api.magentlab.com/api/calc/dapt?age=60&myocardial_infarction_at_presentation=false&prior_mi_or_pci=false&diabetes=false&stent_diameter_lt_3mm=false&smoking=false&paclitaxel_eluting_stent=false&chf_or_lvef_lt_30=false&vein_graft_intervention=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/dapt?age=60&myocardial_infarction_at_presentation=false&prior_mi_or_pci=false&diabetes=false&stent_diameter_lt_3mm=false&smoking=false&paclitaxel_eluting_stent=false&chf_or_lvef_lt_30=false&vein_graft_intervention=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). Yeh 2016 exclusive bands: younger than 65 scores 0; 65 to younger than 75 scores -1; 75 or older scores -2. Age 75 is -2, not -1.
`myocardial_infarction_at_presentation`	boolean	required	Myocardial infarction at presentation as assigned by the caller (Yeh 2016). true scores 1. magent does not diagnose MI.
`prior_mi_or_pci`	boolean	required	Prior myocardial infarction or prior PCI as assigned by the caller (Yeh 2016). true scores 1.
`diabetes`	boolean	required	Diabetes mellitus as assigned by the caller (Yeh 2016). true scores 1.
`stent_diameter_lt_3mm`	boolean	required	Stent diameter <3 mm as assigned by the caller (Yeh 2016). true scores 1. magent does not measure the stent.
`smoking`	boolean	required	Current cigarette smoking or smoking within the past year as assigned by the caller (Yeh 2016). true scores 1.
`paclitaxel_eluting_stent`	boolean	required	Paclitaxel-eluting stent as assigned by the caller (Yeh 2016). true scores 1.
`chf_or_lvef_lt_30`	boolean	required	Congestive heart failure or LVEF <30% as assigned by the caller (Yeh 2016). true scores 2. magent does not measure LVEF.
`vein_graft_intervention`	boolean	required	Vein-graft PCI as assigned by the caller (Yeh 2016). true scores 2. magent does not interpret the angiogram.

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/dapt 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": "60",
      "chf_or_lvef_lt_30": "false",
      "diabetes": "false",
      "myocardial_infarction_at_presentation": "false",
      "paclitaxel_eluting_stent": "false",
      "prior_mi_or_pci": "false",
      "smoking": "false",
      "stent_diameter_lt_3mm": "false",
      "vein_graft_intervention": "false"
    },
    {
      "age": "60",
      "chf_or_lvef_lt_30": "false",
      "diabetes": "false",
      "myocardial_infarction_at_presentation": "false",
      "paclitaxel_eluting_stent": "false",
      "prior_mi_or_pci": "false",
      "smoking": "false",
      "stent_diameter_lt_3mm": "false",
      "vein_graft_intervention": "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/dapt",
  "items": [
    {
      "components": [
        {
          "value": 60,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "myocardial_infarction_at_presentation",
          "points": 0,
          "present": false
        },
        {
          "factor": "prior_mi_or_pci",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "stent_diameter_lt_3mm",
          "points": 0,
          "present": false
        },
        {
          "factor": "smoking",
          "points": 0,
          "present": false
        },
        {
          "factor": "paclitaxel_eluting_stent",
          "points": 0,
          "present": false
        },
        {
          "factor": "chf_or_lvef_lt_30",
          "points": 0,
          "present": false
        },
        {
          "factor": "vein_graft_intervention",
          "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": "Yeh RW, Secemsky EA, Kereiakes DJ, et al",
        "doi": "10.1001/jama.2016.3775",
        "id": "yeh-2016",
        "pmid": "27022822",
        "source": "JAMA. 2016;315(16):1735-1749",
        "title": "Development and Validation of a Prediction Rule for Benefit and Harm of Dual Antiplatelet Therapy Beyond 1 Year After Percutaneous Coronary Intervention"
      },
      "formula": "dapt",
      "formula_expression": "DAPT = exclusive age (<65: 0, 65 to <75: -1, >=75: -2) + myocardial_infarction_at_presentation 1 + prior_mi_or_pci 1 + diabetes 1 + stent_diameter_lt_3mm 1 + smoking 1 + paclitaxel_eluting_stent 1 + chf_or_lvef_lt_30 2 + vein_graft_intervention 2; max 10; >=2 high, <2 low (Yeh 2016)",
      "age_years": 60,
      "max_score": 10,
      "score": 0,
      "risk_band": "low"
    },
    {
      "components": [
        {
          "value": 60,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "myocardial_infarction_at_presentation",
          "points": 0,
          "present": false
        },
        {
          "factor": "prior_mi_or_pci",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "stent_diameter_lt_3mm",
          "points": 0,
          "present": false
        },
        {
          "factor": "smoking",
          "points": 0,
          "present": false
        },
        {
          "factor": "paclitaxel_eluting_stent",
          "points": 0,
          "present": false
        },
        {
          "factor": "chf_or_lvef_lt_30",
          "points": 0,
          "present": false
        },
        {
          "factor": "vein_graft_intervention",
          "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": "Yeh RW, Secemsky EA, Kereiakes DJ, et al",
        "doi": "10.1001/jama.2016.3775",
        "id": "yeh-2016",
        "pmid": "27022822",
        "source": "JAMA. 2016;315(16):1735-1749",
        "title": "Development and Validation of a Prediction Rule for Benefit and Harm of Dual Antiplatelet Therapy Beyond 1 Year After Percutaneous Coronary Intervention"
      },
      "formula": "dapt",
      "formula_expression": "DAPT = exclusive age (<65: 0, 65 to <75: -1, >=75: -2) + myocardial_infarction_at_presentation 1 + prior_mi_or_pci 1 + diabetes 1 + stent_diameter_lt_3mm 1 + smoking 1 + paclitaxel_eluting_stent 1 + chf_or_lvef_lt_30 2 + vein_graft_intervention 2; max 10; >=2 high, <2 low (Yeh 2016)",
      "age_years": 60,
      "max_score": 10,
      "score": 0,
      "risk_band": "low"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	dapt
`formula_expression`	string	Exact expression used
`score`	integer	Yeh 2016 DAPT points -2 to 10
`max_score`	integer	10
`risk_band`	string	Yeh 2016 band: high if score >=2 (continued thienopyridine associated with larger ischemic-event reduction); low if score <2. A band, not a duration order or diagnosis.
`age_years`	integer	Age used for the exclusive age band
`components`	array	Per-factor points
`citation`	object	Yeh et al. JAMA 2016 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 60,
      "factor": "age",
      "points": 0,
      "present": false
    },
    {
      "factor": "myocardial_infarction_at_presentation",
      "points": 0,
      "present": false
    },
    {
      "factor": "prior_mi_or_pci",
      "points": 0,
      "present": false
    },
    {
      "factor": "diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "stent_diameter_lt_3mm",
      "points": 0,
      "present": false
    },
    {
      "factor": "smoking",
      "points": 0,
      "present": false
    },
    {
      "factor": "paclitaxel_eluting_stent",
      "points": 0,
      "present": false
    },
    {
      "factor": "chf_or_lvef_lt_30",
      "points": 0,
      "present": false
    },
    {
      "factor": "vein_graft_intervention",
      "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": "Yeh RW, Secemsky EA, Kereiakes DJ, et al",
    "doi": "10.1001/jama.2016.3775",
    "id": "yeh-2016",
    "pmid": "27022822",
    "source": "JAMA. 2016;315(16):1735-1749",
    "title": "Development and Validation of a Prediction Rule for Benefit and Harm of Dual Antiplatelet Therapy Beyond 1 Year After Percutaneous Coronary Intervention"
  },
  "formula": "dapt",
  "formula_expression": "DAPT = exclusive age (<65: 0, 65 to <75: -1, >=75: -2) + myocardial_infarction_at_presentation 1 + prior_mi_or_pci 1 + diabetes 1 + stent_diameter_lt_3mm 1 + smoking 1 + paclitaxel_eluting_stent 1 + chf_or_lvef_lt_30 2 + vein_graft_intervention 2; max 10; >=2 high, <2 low (Yeh 2016)",
  "age_years": 60,
  "max_score": 10,
  "score": 0,
  "risk_band": "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_dapt`	each DAPT 2016 item must be a published value for that field. 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

CRUSADE bleeding score — Compute the CRUSADE in-hospital major bleeding score from hematocrit, caller-assigned Cockcroft–Gault creatinine clearance, heart rate, sex, signs of CHF, prior vascular disease, diabetes, and systolic BP (Subherwal 2009 Table 4).

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, 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

HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. 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.