# Fisher 1980 CT Grade Lookup for Subarachnoid Hemorrhage

> Fisher 1980 CT Grade Lookup for Subarachnoid Hemorrhage is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the published Fisher 1980 original CT group description and vasospasm context for a caller-assigned SAH grade (1–4).

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/fisher
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fisher-1980-ct-grade-lookup-for-subarachnoid-hemorrhage-3956ffde
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7IDsGrW5eFXWGYL8pFJdw

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fisher-1980-ct-grade-lookup-for-subarachnoid-hemorrhage-3956ffde
```

Example prompt: The CT shows thick subarachnoid blood — that's Fisher group 3. Can you pull the original Fisher 1980 description and vasospasm context for grade 3?

## When to prefer this

Use this endpoint when you need to look up the original Fisher 1980 CT classification for subarachnoid hemorrhage by group number (1–4), specifically when you need the published description and vasospasm context. Prefer this over manual reference when building clinical decision support tools or automating SAH documentation. Do not use this for the modified Fisher scale (Frontera 2006) or any AI-based CT interpretation — the caller must assign the grade from their own CT read.

## Known failure modes

- Grade outside 1–4 integer range returns an error or no match
- Missing required 'grade' query parameter returns a 400 or validation error
- Non-integer value for grade results in a schema validation error
- Service unavailable returns a 5xx error

## How this service works

Fisher 1980 original CT groups 1-4 for subarachnoid hemorrhage as assigned from CT by the caller. Returns the published group and description. Group 3 (thick SAH) was the high-vasospasm group; group 4 is ICH/IVH without thick SAH, not a worse grade than 3. Not modified Fisher 2006. Not a diagnosis; magent does not read the CT.

## Output

Returns the Fisher 1980 original CT group number with its published label and descriptive text, including a note on vasospasm relevance (e.g., group 3 as the high-vasospasm group) and clarification that group 4 (ICH/IVH without thick SAH) is not considered a worse vasospasm grade than group 3.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "grade"
     ],
     "properties": {
      "grade": {
       "type": "integer",
       "description": "Fisher 1980 original CT group 1-4 as assigned by the caller from CT. magent does not read the CT."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "path": "/api/calc/fisher",
  "count": 2,
  "items": [
   {
    "grade": 1,
    "score": 1,
    "formula": "fisher",
    "citation": {
     "id": "fisher-1980",
     "doi": "10.1227/00006123-198001000-00001",
     "pmid": "7354892",
     "title": "Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning",
     "source": "Neurosurgery. 1980;6(1):1-9",
     "authors": "Fisher CM, Kistler JP, Davis JM"
    },
    "max_score": 4,
    "components": [
     {
      "factor": "grade",
      "points": 1,
      "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.",
    "description": "No blood detected",
    "formula_expression": "Fisher 1980 original CT group 1-4 as assigned by the caller"
   },
   {
    "grade": 1,
    "score": 1,
    "formula": "fisher",
    "citation": {
     "id": "fisher-1980",
     "doi": "10.1227/00006123-198001000-00001",
     "pmid": "7354892",
     "title": "Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning",
     "source": "Neurosurgery. 1980;6(1):1-9",
     "authors": "Fisher CM, Kistler JP, Davis JM"
    },
    "max_score": 4,
    "components": [
     {
      "factor": "grade",
      "points": 1,
      "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.",
    "description": "No blood detected",
    "formula_expression": "Fisher 1980 original CT group 1-4 as assigned by the caller"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fisher-1980-ct-grade-lookup-for-subarachnoid-hemorrhage-3956ffde/health.json
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