Kahn 2009 Villalta scale (ISTH SSC)
Kahn 2009 Villalta scale (ISTH SSC): five caller-assigned symptoms and six signs, each 0-3 (none/mild/moderate/severe), summed 0-33. Venous ulcer is a separate boolean and is not added as 15 points. PTS if score ≥5 or ulcer; bands none 0-4 (no ulcer), mild 5-9, moderate 10-14, severe if ≥15 or ulcer. magent does not examine the limb. Not CEAP, not VCSS, not Ginsberg PTS.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
298 msmedian answer time
$0.005listed price per call
$0.007price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.magentlab.com/api/calc/villalta
| Category | Everything else |
|---|---|
| Provider host | api.magentlab.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.007 | 298 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"cramps": 0,
"heaviness": 0,
"hyperpigmentation": 0,
"pain": 0,
"pain_on_calf_compression": 0,
"paresthesia": 0,
"pretibial_edema": 0,
"pruritus": 0,
"redness": 0,
"skin_induration": 0,
"ulcer": false,
"venous_ectasia": 0
},
{
"cramps": 0,
"heaviness": 0,
"hyperpigmentation": 0,
"pain": 0,
"pain_on_calf_compression": 0,
"paresthesia": 0,
"pretibial_edema": 0,
"pruritus": 0,
"redness": 0,
"skin_induration": 0,
"ulcer": false,
"venous_ectasia": 0
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"cramps": {
"description": "Caller-assigned Kahn 2009 Villalta symptom cramps (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"heaviness": {
"description": "Caller-assigned Kahn 2009 Villalta symptom heaviness (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"hyperpigmentation": {
"description": "Caller-assigned Kahn 2009 Villalta sign hyperpigmentation (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"pain": {
"description": "Caller-assigned Kahn 2009 Villalta symptom pain (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"pain_on_calf_compression": {
"description": "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.",
"type": "integer"
},
"paresthesia": {
"description": "Caller-assigned Kahn 2009 Villalta symptom paresthesia (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"pretibial_edema": {
"description": "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.",
"type": "integer"
},
"pruritus": {
"description": "Caller-assigned Kahn 2009 Villalta symptom pruritus (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"redness": {
"description": "Caller-assigned Kahn 2009 Villalta sign redness (integer 0-3: 0 none, 1 mild, 2 moderate, 3 severe). magent does not examine the limb.",
"type": "integer"
},
"skin_induration": {
"description": "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.",
"type": "integer"
},
"ulcer": {
"description": "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.",
"type": "boolean"
},
"venous_ectasia": {
"description": "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.",
"type": "integer"
}
},
"required": [
"pain",
"cramps",
"heaviness",
"pruritus",
"paresthesia",
"pretibial_edema",
"skin_induration",
"hyperpigmentation",
"venous_ectasia",
"redness",
"pain_on_calf_compression",
"ulcer"
],
"type": "object"
},
"maxItems": 25,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}