Neurology · LIVE

2HELPS2B (Struck)

2HELPS2B

Sum the Struck 2017 2HELPS2B EEG flags and return the published probable-seizure risk percent.

LIVE $0.005 USDC GET /api/calc/2helps2b

Markdown: /docs/2helps2b.md · Canonical: https://magentlab.com/docs/2helps2b

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

What it computes

Sum the Struck 2017 2HELPS2B EEG flags and return the published probable-seizure risk percent.

When to use

When an agent already has the six Struck 2017 flags assigned from an EEG report and needs the published point total and seizure-risk percent, not a seizure diagnosis.

When not to use

Not a medical device and not a seizure diagnosis. magent does not read EEG.
This tool is the Struck 2017 2HELPS2B score and published probable-seizure percents only. It is not a monitoring-duration protocol.
Flags are caller-assigned. BIRDs, periodic or rhythmic patterns, frequency, plus features, and prior seizure must already be determined by the caller.

Formula

2HELPS2B = birds (true 2) + lpd_lrda_bipd (true 1) + prior_seizure (true 1) + sporadic_epileptiform (true 1) + frequency_gt_2hz (true 1) + plus_features (true 1); Struck 2017; max 7; 0→5%, 1→12%, 2→27%, 3→50%, 4→73%, 5→88%, 6-7→>95%

Citation

Title: Association of an electroencephalography-based risk score with seizure probability in hospitalized patients
Authors: Struck AF, Ustun B, Rodriguez Ruiz AA, Lee JW, LaRoche SM, Hirsch LJ, Gilmore EJ, Vlachy J, Haider HA, Rudin C, Westover MB
Source: JAMA Neurol. 2017;74(12):1419-1424
DOI: 10.1001/jamaneurol.2017.2459

Worked example

All flags false

Given: birds=falsefrequency_gt_2hz=falselpd_lrda_bipd=falseplus_features=falseprior_seizure=falsesporadic_epileptiform=false

birds false → 0; remaining flags false → 0 each
Score = 0 (max 7); seizure_risk = 5%

All flags true

Given: birds=truefrequency_gt_2hz=truelpd_lrda_bipd=trueplus_features=trueprior_seizure=truesporadic_epileptiform=true

birds true → 2; remaining flags true → 1 each
Score = 7 (max 7); seizure_risk = >95%

Also searched as

2HELPS2B
Struck 2017
2HELPS2B score
EEG seizure risk
BIRDs EEG
LPD LRDA BIPD
hospital EEG seizure probability
2 helps 2B
brief ictal rhythmic discharges

Try

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

/api/calc/2helps2b?birds=false&lpd_lrda_bipd=false&prior_seizure=false&sporadic_epileptiform=false&frequency_gt_2hz=false&plus_features=false

Full URL: https://api.magentlab.com/api/calc/2helps2b?birds=false&lpd_lrda_bipd=false&prior_seizure=false&sporadic_epileptiform=false&frequency_gt_2hz=false&plus_features=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/2helps2b?birds=false&lpd_lrda_bipd=false&prior_seizure=false&sporadic_epileptiform=false&frequency_gt_2hz=false&plus_features=false"

Parameters

Name	Type	Required	Description
`birds`	boolean	required	Brief (ictal) rhythmic discharges (BIRDs) as assigned by the caller (Struck 2017). true scores 2. magent does not read EEG.
`lpd_lrda_bipd`	boolean	required	LPD or LRDA or BIPD as assigned by the caller (Struck 2017). true scores 1. magent does not read EEG.
`prior_seizure`	boolean	required	Prior seizure, acute or remote, as assigned by the caller (Struck 2017). true scores 1.
`sporadic_epileptiform`	boolean	required	Sporadic epileptiform discharges as assigned by the caller (Struck 2017). true scores 1. magent does not read EEG.
`frequency_gt_2hz`	boolean	required	Frequency >2.0 Hz for any periodic or rhythmic pattern as assigned by the caller (Struck 2017). true scores 1. magent does not read EEG.
`plus_features`	boolean	required	Plus features (superimposed rhythmic, sharp, or fast activity) as assigned by the caller (Struck 2017). true scores 1. magent does not read EEG.

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/2helps2b 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": [
    {
      "birds": "false",
      "frequency_gt_2hz": "false",
      "lpd_lrda_bipd": "false",
      "plus_features": "false",
      "prior_seizure": "false",
      "sporadic_epileptiform": "false"
    },
    {
      "birds": "false",
      "frequency_gt_2hz": "false",
      "lpd_lrda_bipd": "false",
      "plus_features": "false",
      "prior_seizure": "false",
      "sporadic_epileptiform": "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/2helps2b",
  "items": [
    {
      "components": [
        {
          "factor": "birds",
          "points": 0,
          "present": false
        },
        {
          "factor": "lpd_lrda_bipd",
          "points": 0,
          "present": false
        },
        {
          "factor": "prior_seizure",
          "points": 0,
          "present": false
        },
        {
          "factor": "sporadic_epileptiform",
          "points": 0,
          "present": false
        },
        {
          "factor": "frequency_gt_2hz",
          "points": 0,
          "present": false
        },
        {
          "factor": "plus_features",
          "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": "Struck AF, Ustun B, Rodriguez Ruiz AA, Lee JW, LaRoche SM, Hirsch LJ, Gilmore EJ, Vlachy J, Haider HA, Rudin C, Westover MB",
        "doi": "10.1001/jamaneurol.2017.2459",
        "id": "struck-2017",
        "pmid": "29052706",
        "source": "JAMA Neurol. 2017;74(12):1419-1424",
        "title": "Association of an electroencephalography-based risk score with seizure probability in hospitalized patients"
      },
      "formula": "2helps2b",
      "formula_expression": "2HELPS2B = birds (true 2) + lpd_lrda_bipd (true 1) + prior_seizure (true 1) + sporadic_epileptiform (true 1) + frequency_gt_2hz (true 1) + plus_features (true 1); Struck 2017; max 7; 0→5%, 1→12%, 2→27%, 3→50%, 4→73%, 5→88%, 6-7→>95%",
      "max_score": 7,
      "score": 0,
      "seizure_risk": "5%"
    },
    {
      "components": [
        {
          "factor": "birds",
          "points": 0,
          "present": false
        },
        {
          "factor": "lpd_lrda_bipd",
          "points": 0,
          "present": false
        },
        {
          "factor": "prior_seizure",
          "points": 0,
          "present": false
        },
        {
          "factor": "sporadic_epileptiform",
          "points": 0,
          "present": false
        },
        {
          "factor": "frequency_gt_2hz",
          "points": 0,
          "present": false
        },
        {
          "factor": "plus_features",
          "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": "Struck AF, Ustun B, Rodriguez Ruiz AA, Lee JW, LaRoche SM, Hirsch LJ, Gilmore EJ, Vlachy J, Haider HA, Rudin C, Westover MB",
        "doi": "10.1001/jamaneurol.2017.2459",
        "id": "struck-2017",
        "pmid": "29052706",
        "source": "JAMA Neurol. 2017;74(12):1419-1424",
        "title": "Association of an electroencephalography-based risk score with seizure probability in hospitalized patients"
      },
      "formula": "2helps2b",
      "formula_expression": "2HELPS2B = birds (true 2) + lpd_lrda_bipd (true 1) + prior_seizure (true 1) + sporadic_epileptiform (true 1) + frequency_gt_2hz (true 1) + plus_features (true 1); Struck 2017; max 7; 0→5%, 1→12%, 2→27%, 3→50%, 4→73%, 5→88%, 6-7→>95%",
      "max_score": 7,
      "score": 0,
      "seizure_risk": "5%"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	2helps2b
`formula_expression`	string	Exact expression used
`score`	integer	2HELPS2B points 0-7
`max_score`	integer	Always 7
`seizure_risk`	string	Struck 2017 published probable seizure risk: 5%, 12%, 27%, 50%, 73%, 88%, or >95%. Not a seizure diagnosis.
`components`	array	Per-flag points
`citation`	object	Struck 2017 JAMA Neurol citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "birds",
      "points": 0,
      "present": false
    },
    {
      "factor": "lpd_lrda_bipd",
      "points": 0,
      "present": false
    },
    {
      "factor": "prior_seizure",
      "points": 0,
      "present": false
    },
    {
      "factor": "sporadic_epileptiform",
      "points": 0,
      "present": false
    },
    {
      "factor": "frequency_gt_2hz",
      "points": 0,
      "present": false
    },
    {
      "factor": "plus_features",
      "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": "Struck AF, Ustun B, Rodriguez Ruiz AA, Lee JW, LaRoche SM, Hirsch LJ, Gilmore EJ, Vlachy J, Haider HA, Rudin C, Westover MB",
    "doi": "10.1001/jamaneurol.2017.2459",
    "id": "struck-2017",
    "pmid": "29052706",
    "source": "JAMA Neurol. 2017;74(12):1419-1424",
    "title": "Association of an electroencephalography-based risk score with seizure probability in hospitalized patients"
  },
  "formula": "2helps2b",
  "formula_expression": "2HELPS2B = birds (true 2) + lpd_lrda_bipd (true 1) + prior_seizure (true 1) + sporadic_epileptiform (true 1) + frequency_gt_2hz (true 1) + plus_features (true 1); Struck 2017; max 7; 0→5%, 1→12%, 2→27%, 3→50%, 4→73%, 5→88%, 6-7→>95%",
  "max_score": 7,
  "score": 0,
  "seizure_risk": "5%"
}

Client errors (HTTP 400)

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

HTTP	Code	When
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.
CAM-ICU — Apply the Ely 2001 CAM-ICU algorithm and return whether delirium is present from four caller-assigned features.

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.