Respiratory · LIVE

GOLD spirometric COPD grade

GOLD spirometric grade

Apply the 2017 GOLD executive summary spirometric classification: obstruction when post-bronchodilator FEV1/FVC is < 0.70, then GOLD grades 1-4 from FEV1 percent predicted.

LIVE $0.005 USDC GET /api/calc/gold_copd

Markdown: /docs/gold-copd.md · Canonical: https://magentlab.com/docs/gold-copd

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

What it computes

Apply the 2017 GOLD executive summary spirometric classification: obstruction when post-bronchodilator FEV1/FVC is < 0.70, then GOLD grades 1-4 from FEV1 percent predicted.

When to use

When an agent already has post-bronchodilator FEV1 percent predicted and FEV1/FVC and needs the published GOLD 1-4 grade or a not_obstructed result. magent does not perform spirometry. Not GOLD ABE.

When not to use

• Not a medical device and not a diagnosis of COPD.
• Not GOLD ABE: this tool does not implement ABE groups (mMRC, CAT, or exacerbations).
• magent does not perform spirometry. fev1_percent_predicted and fev1_fvc_ratio are caller-supplied post-bronchodilator values.
• GOLD 1-4 apply only when FEV1/FVC is < 0.70. A ratio of 0.70 or higher returns not_obstructed even if FEV1 percent predicted is low.
• This is the 2017 GOLD executive summary spirometric classification only (Vogelmeier et al.). It is not a treatment recommendation.

Formula

If post-bronchodilator FEV1/FVC >= 0.70 then gold_grade is not_obstructed (no GOLD 1-4). If FEV1/FVC < 0.70: GOLD 1 (mild) FEV1 >= 80% predicted; GOLD 2 (moderate) 50% <= FEV1 < 80%; GOLD 3 (severe) 30% <= FEV1 < 50%; GOLD 4 (very severe) FEV1 < 30% (Vogelmeier 2017 GOLD executive summary)

Citation

Title

Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Lung Disease 2017 Report. GOLD Executive Summary

Authors

Vogelmeier CF, Criner GJ, Martinez FJ, Anzueto A, Barnes PJ, Bourbeau J, Celli BR, Chen R, Decramer M, Fabbri LM, Frith P, Halpin DMG, López Varela MV, Nishimura M, Roche N, Rodriguez-Roisin R, Sin DD, Singh D, Stockley R, Vestbo J, Wedzicha JA, Agustí A

Source

Eur Respir J. 2017;49(3):1700214

DOI

10.1183/13993003.00214-2017

Worked example

Also searched as

• GOLD spirometric grade
• GOLD 1-4 COPD
• FEV1 FVC obstruction
• GOLD airflow limitation
• Vogelmeier 2017 GOLD
• post-bronchodilator FEV1 grade
• GOLD mild moderate severe
• COPD spirometric classification

Try

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

/api/calc/gold_copd?fev1_percent_predicted=85&fev1_fvc_ratio=0.65

Full URL: https://api.magentlab.com/api/calc/gold_copd?fev1_percent_predicted=85&fev1_fvc_ratio=0.65

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/gold_copd?fev1_percent_predicted=85&fev1_fvc_ratio=0.65"

Parameters

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/gold_copd 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": [
    {
      "fev1_fvc_ratio": "0.65",
      "fev1_percent_predicted": "85"
    },
    {
      "fev1_fvc_ratio": "0.65",
      "fev1_percent_predicted": "85"
    }
  ]
}

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/gold_copd",
  "items": [
    {
      "components": [
        {
          "value": 0.65,
          "factor": "obstructed",
          "met": true
        },
        {
          "value": 85.0,
          "factor": "gold_1",
          "met": true
        },
        {
          "value": 85.0,
          "factor": "gold_2",
          "met": false
        },
        {
          "value": 85.0,
          "factor": "gold_3",
          "met": false
        },
        {
          "value": 85.0,
          "factor": "gold_4",
          "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": "Vogelmeier CF, Criner GJ, Martinez FJ, Anzueto A, Barnes PJ, Bourbeau J, Celli BR, Chen R, Decramer M, Fabbri LM, Frith P, Halpin DMG, López Varela MV, Nishimura M, Roche N, Rodriguez-Roisin R, Sin DD, Singh D, Stockley R, Vestbo J, Wedzicha JA, Agustí A",
        "doi": "10.1183/13993003.00214-2017",
        "id": "vogelmeier-2017",
        "source": "Eur Respir J. 2017;49(3):1700214",
        "title": "Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Lung Disease 2017 Report. GOLD Executive Summary"
      },
      "formula": "gold_copd",
      "formula_expression": "If post-bronchodilator FEV1/FVC >= 0.70 then gold_grade is not_obstructed (no GOLD 1-4). If FEV1/FVC < 0.70: GOLD 1 (mild) FEV1 >= 80% predicted; GOLD 2 (moderate) 50% <= FEV1 < 80%; GOLD 3 (severe) 30% <= FEV1 < 50%; GOLD 4 (very severe) FEV1 < 30% (Vogelmeier 2017 GOLD executive summary)",
      "fev1_percent_predicted": 85.0,
      "fev1_fvc_ratio": 0.65,
      "gold_grade": "1",
      "obstructed": true
    },
    {
      "components": [
        {
          "value": 0.65,
          "factor": "obstructed",
          "met": true
        },
        {
          "value": 85.0,
          "factor": "gold_1",
          "met": true
        },
        {
          "value": 85.0,
          "factor": "gold_2",
          "met": false
        },
        {
          "value": 85.0,
          "factor": "gold_3",
          "met": false
        },
        {
          "value": 85.0,
          "factor": "gold_4",
          "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": "Vogelmeier CF, Criner GJ, Martinez FJ, Anzueto A, Barnes PJ, Bourbeau J, Celli BR, Chen R, Decramer M, Fabbri LM, Frith P, Halpin DMG, López Varela MV, Nishimura M, Roche N, Rodriguez-Roisin R, Sin DD, Singh D, Stockley R, Vestbo J, Wedzicha JA, Agustí A",
        "doi": "10.1183/13993003.00214-2017",
        "id": "vogelmeier-2017",
        "source": "Eur Respir J. 2017;49(3):1700214",
        "title": "Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Lung Disease 2017 Report. GOLD Executive Summary"
      },
      "formula": "gold_copd",
      "formula_expression": "If post-bronchodilator FEV1/FVC >= 0.70 then gold_grade is not_obstructed (no GOLD 1-4). If FEV1/FVC < 0.70: GOLD 1 (mild) FEV1 >= 80% predicted; GOLD 2 (moderate) 50% <= FEV1 < 80%; GOLD 3 (severe) 30% <= FEV1 < 50%; GOLD 4 (very severe) FEV1 < 30% (Vogelmeier 2017 GOLD executive summary)",
      "fev1_percent_predicted": 85.0,
      "fev1_fvc_ratio": 0.65,
      "gold_grade": "1",
      "obstructed": true
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0.65,
      "factor": "obstructed",
      "met": true
    },
    {
      "value": 85.0,
      "factor": "gold_1",
      "met": true
    },
    {
      "value": 85.0,
      "factor": "gold_2",
      "met": false
    },
    {
      "value": 85.0,
      "factor": "gold_3",
      "met": false
    },
    {
      "value": 85.0,
      "factor": "gold_4",
      "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": "Vogelmeier CF, Criner GJ, Martinez FJ, Anzueto A, Barnes PJ, Bourbeau J, Celli BR, Chen R, Decramer M, Fabbri LM, Frith P, Halpin DMG, López Varela MV, Nishimura M, Roche N, Rodriguez-Roisin R, Sin DD, Singh D, Stockley R, Vestbo J, Wedzicha JA, Agustí A",
    "doi": "10.1183/13993003.00214-2017",
    "id": "vogelmeier-2017",
    "source": "Eur Respir J. 2017;49(3):1700214",
    "title": "Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Lung Disease 2017 Report. GOLD Executive Summary"
  },
  "formula": "gold_copd",
  "formula_expression": "If post-bronchodilator FEV1/FVC >= 0.70 then gold_grade is not_obstructed (no GOLD 1-4). If FEV1/FVC < 0.70: GOLD 1 (mild) FEV1 >= 80% predicted; GOLD 2 (moderate) 50% <= FEV1 < 80%; GOLD 3 (severe) 30% <= FEV1 < 50%; GOLD 4 (very severe) FEV1 < 30% (Vogelmeier 2017 GOLD executive summary)",
  "fev1_percent_predicted": 85.0,
  "fev1_fvc_ratio": 0.65,
  "gold_grade": "1",
  "obstructed": true
}

Client errors (HTTP 400)

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

Related tools

• mMRC — Return the Mahler 1988 modified Medical Research Council (mMRC) dyspnea grade 0-4 from a caller-assigned integer, with the published grade wording.
• BODE — Sum Celli 2004 BODE points from BMI, FEV1 percent predicted, MMRC dyspnea, and 6-minute walk distance.
• DECAF — Sum Steer 2012 DECAF points from extended MRC dyspnoea, eosinophils, chest radiograph consolidation, arterial pH, and atrial fibrillation.

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.