# Graham 2006 CTS-6 Carpal Tunnel Syndrome Probability Score

> Graham 2006 CTS-6 Carpal Tunnel Syndrome Probability Score is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Computes the Graham 2006 CTS-6 clinical score from six boolean findings to estimate probability of carpal tunnel syndrome

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/cts_6
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/graham-2006-cts-6-carpal-tunnel-syndrome-probability-score-e1dcc472
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sqL8qSJ2I1idNaEl29irZ

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 graham-2006-cts-6-carpal-tunnel-syndrome-probability-score-e1dcc472
```

Example prompt: Calculate the Graham 2006 CTS-6 score for a patient who has numbness primarily in the median nerve territory, nocturnal numbness, a positive Phalen test, a positive Tinel sign, but no thenar atrophy or weakness and no two-point discrimination loss.

## When to prefer this

Use this endpoint when you need a deterministic, citation-backed arithmetic computation of the Graham 2006 CTS-6 score from caller-supplied physical exam booleans, and when you explicitly do not need EMG results, the Boston Carpal Tunnel Questionnaire, or any patient-interactive diagnostic device. Prefer this over generic medical knowledge retrieval when reproducibility and a published reference score are required.

## Known failure modes

- Missing any of the six required boolean query parameters returns a validation error
- Non-boolean values for boolean parameters cause a parse or validation error
- Network or payment authorization failure returns an HTTP 402 or 5xx error

## How this service works

Graham 2006 CTS-6 from six caller-assigned booleans with published discrete weights (median-territory numbness 3.5, nocturnal numbness 4, thenar atrophy or weakness 5, Phalen 5, two-point discrimination loss 4.5, Tinel 4; max 26). Score >5 is associated with ≈25% probability of CTS; score >12 with ≈80%. magent does not examine the patient. Deterministic published arithmetic with citation; not a CTS diagnosis, not an EMG order, not a Boston questionnaire, and not a medical device.

## Output

Returns the computed CTS-6 total score (maximum 26) derived from summing the weighted boolean inputs per Graham 2006 published weights. A score above 5 is associated with approximately 25% probability of CTS; a score above 12 with approximately 80% probability. The response does not constitute a diagnosis, EMG order, or medical device output.

## 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": [
      "median_numbness",
      "nocturnal_numbness",
      "thenar_atrophy_or_weakness",
      "phalen_positive",
      "two_point_discrimination_loss",
      "tinel_positive"
     ],
     "properties": {
      "tinel_positive": {
       "type": "boolean",
       "description": "Positive Tinel sign (Graham 2006, 4 if true). true or false as assigned by the caller. magent does not examine the patient."
      },
      "median_numbness": {
       "type": "boolean",
       "description": "Numbness predominantly or exclusively in the median nerve territory (Graham 2006, 3.5 if true). true or false as assigned by the caller. magent does not examine the patient."
      },
      "phalen_positive": {
       "type": "boolean",
       "description": "Positive Phalen test (Graham 2006, 5 if true). true or false as assigned by the caller. magent does not examine the patient."
      },
      "nocturnal_numbness": {
       "type": "boolean",
       "description": "Nocturnal numbness (Graham 2006, 4 if true). true or false as assigned by the caller. magent does not examine the patient."
      },
      "thenar_atrophy_or_weakness": {
       "type": "boolean",
       "description": "Thenar atrophy or weakness (Graham 2006, 5 if true). true or false as assigned by the caller. magent does not examine the patient."
      },
      "two_point_discrimination_loss": {
       "type": "boolean",
       "description": "Loss of two-point discrimination (Graham 2006, 4.5 if true). true or false as assigned by the caller. magent does not examine the patient."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/graham-2006-cts-6-carpal-tunnel-syndrome-probability-score-e1dcc472/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)