Villalta post-thrombotic syndrome scale

Villalta

Sum five caller-assigned Villalta symptoms and six signs (each integer 0-3) and return the Kahn 2009 PTS band. Venous ulcer is a separate boolean and is not added as 15 points.

LIVE $0.005 USDC GET /api/calc/villalta

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

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

What it computes

Sum five caller-assigned Villalta symptoms and six signs (each integer 0-3) and return the Kahn 2009 PTS band. Venous ulcer is a separate boolean and is not added as 15 points.

When to use

When an agent has already assigned Kahn 2009 0-3 integers for the eleven items and a venous-ulcer flag and needs the published total and PTS band, not a limb exam, CEAP, VCSS, or Ginsberg PTS.

When not to use

Not a medical device and not a PTS diagnosis, anticoagulation, or compression order. magent does not examine the limb.
Each of the eleven items is a caller-assigned integer 0-3 (0 none, 1 mild, 2 moderate, 3 severe). Venous ulcer is a separate boolean and is not added as 15 points to the numeric score.
Kahn 2009 ISTH SSC bands: none 0-4 without ulcer; mild 5-9; moderate 10-14; severe if score ≥15 or ulcer is present even when the sum is <15.
Not CEAP, not VCSS, and not Ginsberg PTS.

Formula

Villalta = pain + cramps + heaviness + pruritus + paresthesia + pretibial_edema + skin_induration + hyperpigmentation + venous_ectasia + redness + pain_on_calf_compression; each caller-assigned 0-3; max 33; ulcer is a separate boolean and is not added to the score; PTS if score ≥5 or ulcer; none 0-4 (no ulcer); mild 5-9; moderate 10-14; severe if score ≥15 or ulcer

Citation

Title: Measurement properties of the Villalta scale to define and classify the severity of the post-thrombotic syndrome
Authors: Kahn SR
Source: J Thromb Haemost. 2009;7(5):884-888
DOI: 10.1111/j.1538-7836.2009.03339.x

Worked example

All items 0, no ulcer

Given: cramps=0heaviness=0hyperpigmentation=0pain=0pain_on_calf_compression=0paresthesia=0pretibial_edema=0pruritus=0redness=0skin_induration=0ulcer=falsevenous_ectasia=0

Five symptoms 0 + six signs 0; ulcer false is not added to the score
Score = 0 (max 33); pts = false; pts_band none

All items 0, ulcer present

Given: cramps=0heaviness=0hyperpigmentation=0pain=0pain_on_calf_compression=0paresthesia=0pretibial_edema=0pruritus=0redness=0skin_induration=0ulcer=truevenous_ectasia=0

Score remains 0; ulcer does not add 15
pts = true; pts_band severe because ulcer is present

Also searched as

Villalta scale
Villalta PTS
post-thrombotic syndrome
Kahn Villalta
Villalta score
ISTH Villalta
venous PTS scale
postthrombotic syndrome Villalta

Try

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

/api/calc/villalta?pain=0&cramps=0&heaviness=0&pruritus=0&paresthesia=0&pretibial_edema=0&skin_induration=0&hyperpigmentation=0&venous_ectasia=0&redness=0&pain_on_calf_compression=0&ulcer=false

Full URL: https://api.magentlab.com/api/calc/villalta?pain=0&cramps=0&heaviness=0&pruritus=0&paresthesia=0&pretibial_edema=0&skin_induration=0&hyperpigmentation=0&venous_ectasia=0&redness=0&pain_on_calf_compression=0&ulcer=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/villalta?pain=0&cramps=0&heaviness=0&pruritus=0&paresthesia=0&pretibial_edema=0&skin_induration=0&hyperpigmentation=0&venous_ectasia=0&redness=0&pain_on_calf_compression=0&ulcer=false"

Parameters

Name	Type	Required	Description
`pain`	integer	required	Caller-assigned Kahn 2009 Villalta symptom pain (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`cramps`	integer	required	Caller-assigned Kahn 2009 Villalta symptom cramps (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`heaviness`	integer	required	Caller-assigned Kahn 2009 Villalta symptom heaviness (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`pruritus`	integer	required	Caller-assigned Kahn 2009 Villalta symptom pruritus (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`paresthesia`	integer	required	Caller-assigned Kahn 2009 Villalta symptom paresthesia (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`pretibial_edema`	integer	required	Caller-assigned Kahn 2009 Villalta sign pretibial edema (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`skin_induration`	integer	required	Caller-assigned Kahn 2009 Villalta sign skin induration (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`hyperpigmentation`	integer	required	Caller-assigned Kahn 2009 Villalta sign hyperpigmentation (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`venous_ectasia`	integer	required	Caller-assigned Kahn 2009 Villalta sign venous ectasia (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`redness`	integer	required	Caller-assigned Kahn 2009 Villalta sign redness (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`pain_on_calf_compression`	integer	required	Caller-assigned Kahn 2009 Villalta sign pain on calf compression (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.
`ulcer`	boolean	required	Caller-assigned venous ulcer (true or false). Presence classifies PTS as severe (Kahn 2009) and does not add 15 to the numeric score. magent does not examine the limb.

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/villalta 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": [
    {
      "cramps": "0",
      "heaviness": "0",
      "hyperpigmentation": "0",
      "pain": "0",
      "pain_on_calf_compression": "0",
      "paresthesia": "0",
      "pretibial_edema": "0",
      "pruritus": "0",
      "redness": "0",
      "skin_induration": "0",
      "ulcer": "false",
      "venous_ectasia": "0"
    },
    {
      "cramps": "0",
      "heaviness": "0",
      "hyperpigmentation": "0",
      "pain": "0",
      "pain_on_calf_compression": "0",
      "paresthesia": "0",
      "pretibial_edema": "0",
      "pruritus": "0",
      "redness": "0",
      "skin_induration": "0",
      "ulcer": "false",
      "venous_ectasia": "0"
    }
  ]
}

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/villalta",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "pain",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "cramps",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "heaviness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pruritus",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "paresthesia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pretibial_edema",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "skin_induration",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hyperpigmentation",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "venous_ectasia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "redness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pain_on_calf_compression",
          "points": 0,
          "present": true
        }
      ],
      "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": "Kahn SR",
        "doi": "10.1111/j.1538-7836.2009.03339.x",
        "id": "kahn-2009",
        "pmid": "19320818",
        "source": "J Thromb Haemost. 2009;7(5):884-888",
        "title": "Measurement properties of the Villalta scale to define and classify the severity of the post-thrombotic syndrome"
      },
      "formula": "villalta",
      "formula_expression": "Villalta = pain + cramps + heaviness + pruritus + paresthesia + pretibial_edema + skin_induration + hyperpigmentation + venous_ectasia + redness + pain_on_calf_compression; each caller-assigned 0-3; max 33; ulcer is a separate boolean and is not added to the score; PTS if score ≥5 or ulcer; none 0-4 (no ulcer); mild 5-9; moderate 10-14; severe if score ≥15 or ulcer",
      "max_score": 33,
      "score": 0,
      "pts": false,
      "pts_band": "none",
      "ulcer": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "pain",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "cramps",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "heaviness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pruritus",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "paresthesia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pretibial_edema",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "skin_induration",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hyperpigmentation",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "venous_ectasia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "redness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "pain_on_calf_compression",
          "points": 0,
          "present": true
        }
      ],
      "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": "Kahn SR",
        "doi": "10.1111/j.1538-7836.2009.03339.x",
        "id": "kahn-2009",
        "pmid": "19320818",
        "source": "J Thromb Haemost. 2009;7(5):884-888",
        "title": "Measurement properties of the Villalta scale to define and classify the severity of the post-thrombotic syndrome"
      },
      "formula": "villalta",
      "formula_expression": "Villalta = pain + cramps + heaviness + pruritus + paresthesia + pretibial_edema + skin_induration + hyperpigmentation + venous_ectasia + redness + pain_on_calf_compression; each caller-assigned 0-3; max 33; ulcer is a separate boolean and is not added to the score; PTS if score ≥5 or ulcer; none 0-4 (no ulcer); mild 5-9; moderate 10-14; severe if score ≥15 or ulcer",
      "max_score": 33,
      "score": 0,
      "pts": false,
      "pts_band": "none",
      "ulcer": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	villalta
`formula_expression`	string	Exact expression used
`score`	integer	Sum of the eleven Kahn 2009 items (0-33). Venous ulcer is not added as 15 points.
`max_score`	integer	Always 33
`pts`	boolean	true when score ≥5 or ulcer is true (Kahn 2009 PTS definition)
`pts_band`	string	Kahn 2009 band: none (0-4 and no ulcer), mild (5-9), moderate (10-14), or severe (score ≥15 or ulcer). Not a treatment order.
`ulcer`	boolean	Caller-assigned venous ulcer used. Presence classifies severe PTS and does not change score.
`components`	array	Per-item caller-assigned points
`citation`	object	Kahn 2009 J Thromb Haemost citation (ISTH SSC supporting review)
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "pain",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "cramps",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "heaviness",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "pruritus",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "paresthesia",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "pretibial_edema",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "skin_induration",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "hyperpigmentation",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "venous_ectasia",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "redness",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "pain_on_calf_compression",
      "points": 0,
      "present": true
    }
  ],
  "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": "Kahn SR",
    "doi": "10.1111/j.1538-7836.2009.03339.x",
    "id": "kahn-2009",
    "pmid": "19320818",
    "source": "J Thromb Haemost. 2009;7(5):884-888",
    "title": "Measurement properties of the Villalta scale to define and classify the severity of the post-thrombotic syndrome"
  },
  "formula": "villalta",
  "formula_expression": "Villalta = pain + cramps + heaviness + pruritus + paresthesia + pretibial_edema + skin_induration + hyperpigmentation + venous_ectasia + redness + pain_on_calf_compression; each caller-assigned 0-3; max 33; ulcer is a separate boolean and is not added to the score; PTS if score ≥5 or ulcer; none 0-4 (no ulcer); mild 5-9; moderate 10-14; severe if score ≥15 or ulcer",
  "max_score": 33,
  "score": 0,
  "pts": false,
  "pts_band": "none",
  "ulcer": false
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_villalta`	each Villalta symptom and sign must be an integer 0-3 (Kahn 2009 ISTH; 0 none, 1 mild, 2 moderate, 3 severe). 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

IMPROVE VTE — Compute the Spyropoulos 2011 7-factor associative IMPROVE VTE score during hospitalization from age and six caller-assigned flags.

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.