Johansen 1990 Mangled Extremity Severity Score (MESS)
Johansen 1990 Mangled Extremity Severity Score (MESS): caller-assigned skeletal/soft-tissue energy 1-4, limb ischemia 1-3 (doubled if ischemia time >6 hours), shock 0-2, and age points (<30 → 0, 30-50 → 1, >50 → 2). Max 14. MESS ≥7 predicted amputation with 100% accuracy in that series (mess_band 0-6 or >=7). Deterministic published arithmetic with citation. Not an amputation or limb-salvage protocol; magent does not examine the limb. Not later papers' cutoff of 8.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
266 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/mess
| 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 | $0.007 | 266 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"age": 25,
"ischemia_over_6h": false,
"limb_ischemia": 1,
"shock": 0,
"skeletal_soft_tissue": 1
},
{
"age": 25,
"ischemia_over_6h": false,
"limb_ischemia": 1,
"shock": 0,
"skeletal_soft_tissue": 1
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"age": {
"description": "Age in years (integer 0-120). Johansen 1990 points: <30 \u2192 0, 30-50 \u2192 1, >50 \u2192 2. Not the adult 18-120 clamp.",
"type": "integer"
},
"ischemia_over_6h": {
"description": "true if limb ischemia time is greater than 6 hours (Johansen 1990 doubles the ischemia score). true or false as assigned by the caller.",
"type": "boolean"
},
"limb_ischemia": {
"description": "Caller-assigned Johansen 1990 limb ischemia (integer 1 pulse reduced but perfusion normal, 2 pulseless with paresthesia, or 3 cool paralyzed insensate). Doubled when ischemia_over_6h is true.",
"type": "integer"
},
"shock": {
"description": "Caller-assigned Johansen 1990 shock (integer 0 SBP always >90, 1 transient <90, or 2 persistent <90).",
"type": "integer"
},
"skeletal_soft_tissue": {
"description": "Caller-assigned Johansen 1990 skeletal/soft-tissue energy (integer 1 low, 2 medium, 3 high, or 4 very high). magent does not examine the limb.",
"type": "integer"
}
},
"required": [
"skeletal_soft_tissue",
"limb_ischemia",
"shock",
"age",
"ischemia_over_6h"
],
"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"
}