MGFA Clinical Classification (Jaretzki 2000)

MGFA

Echo the caller-assigned Jaretzki 2000 Table 1 MGFA Clinical Classification class (I, IIa, IIb, IIIa, IIIb, IVa, IVb, or V) with the published class description. Class V is intubation except routine postoperative management. A feeding tube without intubation is class IVb.

LIVE $0.005 USDC GET /api/calc/mgfa

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

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

What it computes

When to use

When an agent already has a Jaretzki 2000 Table 1 MGFA class as assigned by the caller and needs the published description. magent does not examine the patient, assign class from findings, map to QMG or MG-ADL, or use Osserman.

When not to use

Not a medical device. magent does not examine the patient.
The caller assigns MGFA class I, IIa, IIb, IIIa, IIIb, IVa, IVb, or V. magent does not grade strength, inspect the eyes, or decide intubation or a feeding tube.
Jaretzki 2000 Table 1 MGFA Clinical Classification only. This is not an outcome measure; the Task Force states the classification should not be used to measure outcome (QMG is separate).
Not QMG. Not MG-ADL. Not Osserman. Not a treatment, intubation, or feeding-tube order.

Formula

mgfa_class in {I, IIa, IIb, IIIa, IIIb, IVa, IVb, V} as assigned by the caller (Jaretzki 2000 Table 1 MGFA Clinical Classification). Not QMG. Not MG-ADL. Not Osserman. Not an outcome measure.

Citation

Title: Myasthenia gravis: recommendations for clinical research standards. Task Force of the Medical Scientific Advisory Board of the Myasthenia Gravis Foundation of America
Authors: Jaretzki A 3rd, Barohn RJ, Ernstoff RM, Kaminski HJ, Keesey JC, Penn AS, Sanders DB
Source: Ann Thorac Surg. 2000;70(1):327-334
DOI: 10.1016/s0003-4975(00)01595-2

Worked example

Class I ocular only

Given: mgfa_class=I

mgfa_class I as assigned by the caller
ocular muscle weakness only; all other muscle strength is normal
intubation_class is false

Class IVb feeding tube without intubation

Given: mgfa_class=IVb

mgfa_class IVb as assigned by the caller
severe oropharyngeal/respiratory predominance; feeding tube without intubation is IVb
intubation_class is false

Class V intubation

Given: mgfa_class=V

mgfa_class V as assigned by the caller
defined by intubation with or without mechanical ventilation, except routine postoperative management
intubation_class is true

Also searched as

MGFA class
MGFA Clinical Classification
Jaretzki 2000
myasthenia gravis class
MGFA I IIa IIb
MGFA class V intubation
MGFA IVb feeding tube
Myasthenia Gravis Foundation of America class
MGFA Task Force classification

Try

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

/api/calc/mgfa?mgfa_class=I

Full URL: https://api.magentlab.com/api/calc/mgfa?mgfa_class=I

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/mgfa?mgfa_class=I"

Parameters

Name	Type	Required	Description
`mgfa_class`	string	required	Jaretzki 2000 Table 1 MGFA Clinical Classification as assigned by the caller: I, IIa, IIb, IIIa, IIIb, IVa, IVb, or V (case-sensitive; reject i, 1, II, IIA). Class I ocular only; II mild, III moderate, IV severe generalized with a = limb/axial and b = oropharyngeal/respiratory; IVb includes feeding tube without intubation; V is intubation except routine postoperative management. magent does not examine the patient.

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/mgfa 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": [
    {
      "mgfa_class": "I"
    },
    {
      "mgfa_class": "I"
    }
  ]
}

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/mgfa",
  "items": [
    {
      "description": "Any ocular muscle weakness. May have weakness of eye closure. All other muscle strength is normal.",
      "components": [
        {
          "factor": "class_I",
          "met": true
        },
        {
          "factor": "class_IIa",
          "met": false
        },
        {
          "factor": "class_IIb",
          "met": false
        },
        {
          "factor": "class_IIIa",
          "met": false
        },
        {
          "factor": "class_IIIb",
          "met": false
        },
        {
          "factor": "class_IVa",
          "met": false
        },
        {
          "factor": "class_IVb",
          "met": false
        },
        {
          "factor": "class_V",
          "met": false
        }
      ],
      "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": "Jaretzki A 3rd, Barohn RJ, Ernstoff RM, Kaminski HJ, Keesey JC, Penn AS, Sanders DB",
        "doi": "10.1016/s0003-4975(00)01595-2",
        "id": "jaretzki-2000",
        "pmid": "10921745",
        "source": "Ann Thorac Surg. 2000;70(1):327-334",
        "title": "Myasthenia gravis: recommendations for clinical research standards. Task Force of the Medical Scientific Advisory Board of the Myasthenia Gravis Foundation of America"
      },
      "formula": "mgfa",
      "formula_expression": "mgfa_class in {I, IIa, IIb, IIIa, IIIb, IVa, IVb, V} as assigned by the caller (Jaretzki 2000 Table 1 MGFA Clinical Classification). Not QMG. Not MG-ADL. Not Osserman. Not an outcome measure.",
      "intubation_class": false,
      "mgfa_class": "I"
    },
    {
      "description": "Any ocular muscle weakness. May have weakness of eye closure. All other muscle strength is normal.",
      "components": [
        {
          "factor": "class_I",
          "met": true
        },
        {
          "factor": "class_IIa",
          "met": false
        },
        {
          "factor": "class_IIb",
          "met": false
        },
        {
          "factor": "class_IIIa",
          "met": false
        },
        {
          "factor": "class_IIIb",
          "met": false
        },
        {
          "factor": "class_IVa",
          "met": false
        },
        {
          "factor": "class_IVb",
          "met": false
        },
        {
          "factor": "class_V",
          "met": false
        }
      ],
      "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": "Jaretzki A 3rd, Barohn RJ, Ernstoff RM, Kaminski HJ, Keesey JC, Penn AS, Sanders DB",
        "doi": "10.1016/s0003-4975(00)01595-2",
        "id": "jaretzki-2000",
        "pmid": "10921745",
        "source": "Ann Thorac Surg. 2000;70(1):327-334",
        "title": "Myasthenia gravis: recommendations for clinical research standards. Task Force of the Medical Scientific Advisory Board of the Myasthenia Gravis Foundation of America"
      },
      "formula": "mgfa",
      "formula_expression": "mgfa_class in {I, IIa, IIb, IIIa, IIIb, IVa, IVb, V} as assigned by the caller (Jaretzki 2000 Table 1 MGFA Clinical Classification). Not QMG. Not MG-ADL. Not Osserman. Not an outcome measure.",
      "intubation_class": false,
      "mgfa_class": "I"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	mgfa
`formula_expression`	string	Published Jaretzki 2000 Table 1 class rule
`mgfa_class`	string	Caller-assigned class I, IIa, IIb, IIIa, IIIb, IVa, IVb, or V
`description`	string	Jaretzki 2000 Table 1 wording for that class
`intubation_class`	boolean	true iff mgfa_class is V
`components`	array	Per-class Tree rows class_I, class_IIa, class_IIb, class_IIIa, class_IIIb, class_IVa, class_IVb, class_V with factor and met; exactly one is met
`citation`	object	Jaretzki 2000 Ann Thorac Surg citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "description": "Any ocular muscle weakness. May have weakness of eye closure. All other muscle strength is normal.",
  "components": [
    {
      "factor": "class_I",
      "met": true
    },
    {
      "factor": "class_IIa",
      "met": false
    },
    {
      "factor": "class_IIb",
      "met": false
    },
    {
      "factor": "class_IIIa",
      "met": false
    },
    {
      "factor": "class_IIIb",
      "met": false
    },
    {
      "factor": "class_IVa",
      "met": false
    },
    {
      "factor": "class_IVb",
      "met": false
    },
    {
      "factor": "class_V",
      "met": false
    }
  ],
  "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": "Jaretzki A 3rd, Barohn RJ, Ernstoff RM, Kaminski HJ, Keesey JC, Penn AS, Sanders DB",
    "doi": "10.1016/s0003-4975(00)01595-2",
    "id": "jaretzki-2000",
    "pmid": "10921745",
    "source": "Ann Thorac Surg. 2000;70(1):327-334",
    "title": "Myasthenia gravis: recommendations for clinical research standards. Task Force of the Medical Scientific Advisory Board of the Myasthenia Gravis Foundation of America"
  },
  "formula": "mgfa",
  "formula_expression": "mgfa_class in {I, IIa, IIb, IIIa, IIIb, IVa, IVb, V} as assigned by the caller (Jaretzki 2000 Table 1 MGFA Clinical Classification). Not QMG. Not MG-ADL. Not Osserman. Not an outcome measure.",
  "intubation_class": false,
  "mgfa_class": "I"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_mgfa`	mgfa_class must be I, IIa, IIb, IIIa, IIIb, IVa, IVb, or V (Jaretzki 2000 MGFA Clinical Classification). 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

MG-ADL — Sum eight caller-assigned Wolfe 1999 MG-ADL items (each integer 0-3) and return the published 0-24 total. Does not map to QMG or assign MGFA class.

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.