Sudbury vertigo risk score (Ohle 2025)

Sudbury Vertigo

Sum Ohle 2025 Table 2 Sudbury vertigo points from sex, age>65 flag, diabetes, hypertension, motor or sensory deficit, cerebellar signs, and BPPV diagnosis, and return the Table 3 serious-cause band and the score>4 investigate_further cutoff.

LIVE $0.005 USDC GET /api/calc/sudbury_vertigo

Markdown: /docs/sudbury-vertigo.md · Canonical: https://magentlab.com/docs/sudbury-vertigo

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

What it computes

When to use

When an agent has the published Ohle 2025 ED vertigo flags and needs the Table 2 total, Table 3 grouped serious-cause percent, and the score>4 operating cutoff, and must not invent a HINTS exam, a stroke diagnosis, a CT order, or an integer age.

When not to use

Not a medical device. Not a stroke diagnosis or CT order.
magent does not examine the patient. Cerebellar signs and motor or sensory deficit are caller-assigned.
Not HINTS and not HINTS-plus. This is the Ohle 2025 ED serious-cause-of-vertigo risk score, not a bedside HINTS exam.
age_gt_65 is the published age >65 flag, not years. Age 65 scores 0. Do not send an integer age.
Serious-cause percents are Ohle 2025 Table 3 grouped bands only (score <5 / 5-8 / >8: 0.0 / 2.1 / 41.0). Per-integer percents are not attached. Female + BPPV is -5 and is not clamped. max_score is 17 (positive weights; BPPV is negative and not in the max).
investigate_further is the paper operating cutoff score >4 (sensitivity 100% / specificity 72.1%). It is not an imaging or admission order.

Formula

Sudbury vertigo = male 1 + age_gt_65 1 + diabetes 1 + hypertension 3 + motor_or_sensory_deficit 5 + cerebellar_signs 6 + bppv_diagnosis -5; Ohle 2025 Table 2; Table 3 bands score <5 -> 0.0%, 5-8 -> 2.1%, >8 -> 41.0%; investigate_further iff score >4; max 17 (sum of positive weights; BPPV is negative and not in the max); do not clamp

Citation

Title: Development of a Clinical Risk Score to Risk Stratify for a Serious Cause of Vertigo in Patients Presenting to the Emergency Department
Authors: Ohle R, Savage DW, Roy D, et al.
Source: Ann Emerg Med. 2025;85(2):122-131
DOI: 10.1016/j.annemergmed.2024.06.003

Worked example

Female, no flags (band lt_5)

Given: age_gt_65=falsebppv_diagnosis=falsecerebellar_signs=falsediabetes=falsehypertension=falsemotor_or_sensory_deficit=falsesex=female

Female → 0; age_gt_65 false → 0; diabetes false → 0; hypertension false → 0; motor_or_sensory_deficit false → 0; cerebellar_signs false → 0; bppv_diagnosis false → 0
Score = 0; band lt_5; Table 3 serious-cause percent 0.0%; investigate_further false

Hypertension only (band lt_5)

Given: age_gt_65=falsebppv_diagnosis=falsecerebellar_signs=falsediabetes=falsehypertension=truemotor_or_sensory_deficit=falsesex=female

Hypertension → 3; remaining Table 2 items 0
Score = 3; band lt_5; Table 3 serious-cause percent 0.0%; investigate_further false

Male, age>65, diabetes, and hypertension (band 5_to_8)

Given: age_gt_65=truebppv_diagnosis=falsecerebellar_signs=falsediabetes=truehypertension=truemotor_or_sensory_deficit=falsesex=male

Male → 1; age_gt_65 → 1; diabetes → 1; hypertension → 3
Score = 6; band 5_to_8; Table 3 serious-cause percent 2.1%; investigate_further true

Cerebellar signs and motor or sensory deficit (band gt_8)

Given: age_gt_65=falsebppv_diagnosis=falsecerebellar_signs=truediabetes=falsehypertension=falsemotor_or_sensory_deficit=truesex=female

cerebellar_signs → 6; motor_or_sensory_deficit → 5
Score = 11; band gt_8; Table 3 serious-cause percent 41.0%; investigate_further true

Female and BPPV only (score -5, band lt_5)

Given: age_gt_65=falsebppv_diagnosis=truecerebellar_signs=falsediabetes=falsehypertension=falsemotor_or_sensory_deficit=falsesex=female

Female → 0; bppv_diagnosis → -5
Score = -5 (not clamped); band lt_5; Table 3 serious-cause percent 0.0%; investigate_further false

Also searched as

Sudbury vertigo score
Ohle 2025 vertigo
ED vertigo risk score
serious cause of vertigo
Ohle vertigo clinical risk score
age greater than 65 vertigo
BPPV vertigo risk score
Sudbury ED vertigo

Try

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

/api/calc/sudbury_vertigo?sex=female&age_gt_65=false&diabetes=false&hypertension=false&motor_or_sensory_deficit=false&cerebellar_signs=false&bppv_diagnosis=false

Full URL: https://api.magentlab.com/api/calc/sudbury_vertigo?sex=female&age_gt_65=false&diabetes=false&hypertension=false&motor_or_sensory_deficit=false&cerebellar_signs=false&bppv_diagnosis=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/sudbury_vertigo?sex=female&age_gt_65=false&diabetes=false&hypertension=false&motor_or_sensory_deficit=false&cerebellar_signs=false&bppv_diagnosis=false"

Parameters

Name	Type	Required	Description
`sex`	string	required · female, male	female or male (Ohle 2025 Table 2). Male scores 1. Female scores 0. Assigned by the caller. Do not send a male boolean.
`age_gt_65`	boolean	required	Age greater than 65 as a published yes/no flag (Ohle 2025 Table 2). true scores 1. Age 65 scores 0. true or false. Do not send years. magent does not measure age.
`diabetes`	boolean	required	Diabetes as assigned by the caller (Ohle 2025 Table 2). true or false. 1 point if true. magent does not examine the patient.
`hypertension`	boolean	required	Hypertension as assigned by the caller (Ohle 2025 Table 2). true or false. 3 points if true. magent does not measure blood pressure.
`motor_or_sensory_deficit`	boolean	required	Motor or sensory deficit as assigned by the caller (Ohle 2025 Table 2). true or false. 5 points if true. magent does not examine the patient.
`cerebellar_signs`	boolean	required	Cerebellar signs as assigned by the caller (Ohle 2025 Table 2 footnote: diplopia, dysarthria, dysphagia, dysmetria, ataxia). true or false. 6 points if true. magent does not examine the patient.
`bppv_diagnosis`	boolean	required	BPPV diagnosis as assigned by the caller (Ohle 2025 Table 2). true or false. -5 points if true. magent does not examine the patient.

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/sudbury_vertigo 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_gt_65": "false",
      "bppv_diagnosis": "false",
      "cerebellar_signs": "false",
      "diabetes": "false",
      "hypertension": "false",
      "motor_or_sensory_deficit": "false",
      "sex": "female"
    },
    {
      "age_gt_65": "false",
      "bppv_diagnosis": "false",
      "cerebellar_signs": "false",
      "diabetes": "false",
      "hypertension": "false",
      "motor_or_sensory_deficit": "false",
      "sex": "female"
    }
  ]
}

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/sudbury_vertigo",
  "items": [
    {
      "components": [
        {
          "value": "female",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "age_gt_65",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "factor": "motor_or_sensory_deficit",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebellar_signs",
          "points": 0,
          "present": false
        },
        {
          "factor": "bppv_diagnosis",
          "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": "Ohle R, Savage DW, Roy D, et al.",
        "doi": "10.1016/j.annemergmed.2024.06.003",
        "id": "ohle-2025",
        "pmid": "39093245",
        "source": "Ann Emerg Med. 2025;85(2):122-131",
        "title": "Development of a Clinical Risk Score to Risk Stratify for a Serious Cause of Vertigo in Patients Presenting to the Emergency Department"
      },
      "formula": "sudbury_vertigo",
      "formula_expression": "Sudbury vertigo = male 1 + age_gt_65 1 + diabetes 1 + hypertension 3 + motor_or_sensory_deficit 5 + cerebellar_signs 6 + bppv_diagnosis -5; Ohle 2025 Table 2; Table 3 bands score <5 -> 0.0%, 5-8 -> 2.1%, >8 -> 41.0%; investigate_further iff score >4; max 17 (sum of positive weights; BPPV is negative and not in the max); do not clamp",
      "max_score": 17,
      "score": 0,
      "sex": "female",
      "diabetes": false,
      "hypertension": false,
      "age_gt_65": false,
      "bppv_diagnosis": false,
      "cerebellar_signs": false,
      "investigate_further": false,
      "motor_or_sensory_deficit": false,
      "serious_cause_percent": 0.0,
      "sudbury_band": "lt_5"
    },
    {
      "components": [
        {
          "value": "female",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "age_gt_65",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "factor": "motor_or_sensory_deficit",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebellar_signs",
          "points": 0,
          "present": false
        },
        {
          "factor": "bppv_diagnosis",
          "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": "Ohle R, Savage DW, Roy D, et al.",
        "doi": "10.1016/j.annemergmed.2024.06.003",
        "id": "ohle-2025",
        "pmid": "39093245",
        "source": "Ann Emerg Med. 2025;85(2):122-131",
        "title": "Development of a Clinical Risk Score to Risk Stratify for a Serious Cause of Vertigo in Patients Presenting to the Emergency Department"
      },
      "formula": "sudbury_vertigo",
      "formula_expression": "Sudbury vertigo = male 1 + age_gt_65 1 + diabetes 1 + hypertension 3 + motor_or_sensory_deficit 5 + cerebellar_signs 6 + bppv_diagnosis -5; Ohle 2025 Table 2; Table 3 bands score <5 -> 0.0%, 5-8 -> 2.1%, >8 -> 41.0%; investigate_further iff score >4; max 17 (sum of positive weights; BPPV is negative and not in the max); do not clamp",
      "max_score": 17,
      "score": 0,
      "sex": "female",
      "diabetes": false,
      "hypertension": false,
      "age_gt_65": false,
      "bppv_diagnosis": false,
      "cerebellar_signs": false,
      "investigate_further": false,
      "motor_or_sensory_deficit": false,
      "serious_cause_percent": 0.0,
      "sudbury_band": "lt_5"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	sudbury_vertigo
`formula_expression`	string	Exact Ohle 2025 Table 2 expression
`score`	integer	Ohle 2025 Table 2 points. Theoretical paper range -4 to 17 (male+BPPV = -4). Female + BPPV only is -5 and is allowed; not clamped.
`max_score`	integer	Always 17 (sum of positive weights; BPPV is negative and not in the max)
`sudbury_band`	string	Ohle 2025 Table 3 grouped band: lt_5 if score <5, 5_to_8 if 5<=score<=8, gt_8 if score >8. Not a per-integer rate.
`serious_cause_percent`	number	Ohle 2025 Table 3 grouped serious-cause percent for that band (0.0 / 2.1 / 41.0). Not a per-integer percent.
`investigate_further`	boolean	true iff score >4 (Ohle 2025 operating cutoff: sensitivity 100% / specificity 72.1%). Not a CT or admission order.
`sex`	string	Sex used: female or male
`age_gt_65`	boolean	Caller-assigned age >65 flag used (not years)
`diabetes`	boolean	Caller-assigned diabetes flag used
`hypertension`	boolean	Caller-assigned hypertension flag used
`motor_or_sensory_deficit`	boolean	Caller-assigned motor or sensory deficit flag used
`cerebellar_signs`	boolean	Caller-assigned cerebellar signs flag used
`bppv_diagnosis`	boolean	Caller-assigned BPPV diagnosis flag used
`components`	array	Per-factor points for the seven Ohle 2025 Table 2 items
`citation`	object	Ohle et al. Ann Emerg Med 2025 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": "female",
      "factor": "sex",
      "points": 0,
      "present": false
    },
    {
      "factor": "age_gt_65",
      "points": 0,
      "present": false
    },
    {
      "factor": "diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "hypertension",
      "points": 0,
      "present": false
    },
    {
      "factor": "motor_or_sensory_deficit",
      "points": 0,
      "present": false
    },
    {
      "factor": "cerebellar_signs",
      "points": 0,
      "present": false
    },
    {
      "factor": "bppv_diagnosis",
      "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": "Ohle R, Savage DW, Roy D, et al.",
    "doi": "10.1016/j.annemergmed.2024.06.003",
    "id": "ohle-2025",
    "pmid": "39093245",
    "source": "Ann Emerg Med. 2025;85(2):122-131",
    "title": "Development of a Clinical Risk Score to Risk Stratify for a Serious Cause of Vertigo in Patients Presenting to the Emergency Department"
  },
  "formula": "sudbury_vertigo",
  "formula_expression": "Sudbury vertigo = male 1 + age_gt_65 1 + diabetes 1 + hypertension 3 + motor_or_sensory_deficit 5 + cerebellar_signs 6 + bppv_diagnosis -5; Ohle 2025 Table 2; Table 3 bands score <5 -> 0.0%, 5-8 -> 2.1%, >8 -> 41.0%; investigate_further iff score >4; max 17 (sum of positive weights; BPPV is negative and not in the max); do not clamp",
  "max_score": 17,
  "score": 0,
  "sex": "female",
  "diabetes": false,
  "hypertension": false,
  "age_gt_65": false,
  "bppv_diagnosis": false,
  "cerebellar_signs": false,
  "investigate_further": false,
  "motor_or_sensory_deficit": false,
  "serious_cause_percent": 0.0,
  "sudbury_band": "lt_5"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_sex`	sex must be female or male 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

HINTS — Apply the Kattah 2009 three-step HINTS exam (Head-Impulse, Nystagmus, Test-of-Skew) from three caller-assigned flags and return whether any dangerous central sign is present.

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.