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Rome II IBS criteria

Rome II IBS

Apply the Thompson 1999 Rome II IBS diagnostic criteria and return supporting_features_met (0-3) and whether the published IBS box holds (rome_ii_ibs).

LIVE $0.005 USDC GET /api/calc/rome_ii_ibs

Markdown: /docs/rome-ii-ibs.md · Canonical: https://magentlab.com/docs/rome-ii-ibs

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

What it computes

Apply the Thompson 1999 Rome II IBS diagnostic criteria and return supporting_features_met (0-3) and whether the published IBS box holds (rome_ii_ibs).

When to use

When an agent already has the four caller-assigned Rome II IBS flags as in Thompson 1999 and needs whether the published IBS box holds. magent does not examine the patient.

When not to use

• Not a medical device.
• Not a diagnosis. magent does not diagnose irritable bowel syndrome.
• The caller assigns the four flags. magent does not examine the patient.
• This tool is the Thompson 1999 Rome II IBS diagnostic box only. Not Rome III (pain or discomfort at least 3 days per month), not Rome IV (pain at least 1 day per week), not Manning criteria, and not IBS-C/D/M subtype.

Formula

rome_ii_ibs iff pain_or_discomfort_12_weeks_of_12_months and supporting_features_met >= 2; supporting_features_met counts relieved_with_defecation, onset_change_stool_frequency, and onset_change_stool_form (Thompson 1999 Rome II IBS diagnostic criteria)

Citation

Title

Functional bowel disorders and functional abdominal pain

Authors

Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Müller-Lissner SA

Source

Gut. 1999;45 Suppl 2:II43-II47

DOI

10.1136/gut.45.2008.ii43

Worked example

Also searched as

• Rome II IBS
• Rome II irritable bowel
• Thompson IBS criteria
• functional bowel IBS 1999
• IBS diagnostic criteria Rome II
• Thompson 1999 IBS
• irritable bowel syndrome Rome II
• Rome II IBS box

Try

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

/api/calc/rome_ii_ibs?pain_or_discomfort_12_weeks_of_12_months=true&relieved_with_defecation=true&onset_change_stool_frequency=true&onset_change_stool_form=false

Full URL: https://api.magentlab.com/api/calc/rome_ii_ibs?pain_or_discomfort_12_weeks_of_12_months=true&relieved_with_defecation=true&onset_change_stool_frequency=true&onset_change_stool_form=false

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/rome_ii_ibs?pain_or_discomfort_12_weeks_of_12_months=true&relieved_with_defecation=true&onset_change_stool_frequency=true&onset_change_stool_form=false"

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/rome_ii_ibs 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": [
    {
      "onset_change_stool_form": "false",
      "onset_change_stool_frequency": "true",
      "pain_or_discomfort_12_weeks_of_12_months": "true",
      "relieved_with_defecation": "true"
    },
    {
      "onset_change_stool_form": "false",
      "onset_change_stool_frequency": "true",
      "pain_or_discomfort_12_weeks_of_12_months": "true",
      "relieved_with_defecation": "true"
    }
  ]
}

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/rome_ii_ibs",
  "items": [
    {
      "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": "Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Müller-Lissner SA",
        "doi": "10.1136/gut.45.2008.ii43",
        "id": "thompson-1999",
        "pmid": "10457044",
        "source": "Gut. 1999;45 Suppl 2:II43-II47",
        "title": "Functional bowel disorders and functional abdominal pain"
      },
      "formula": "rome_ii_ibs",
      "formula_expression": "rome_ii_ibs iff pain_or_discomfort_12_weeks_of_12_months and supporting_features_met >= 2; supporting_features_met counts relieved_with_defecation, onset_change_stool_frequency, and onset_change_stool_form (Thompson 1999 Rome II IBS diagnostic criteria)",
      "criteria": [
        {
          "factor": "pain_or_discomfort_12_weeks_of_12_months",
          "met": true
        },
        {
          "factor": "relieved_with_defecation",
          "met": true
        },
        {
          "factor": "onset_change_stool_frequency",
          "met": true
        },
        {
          "factor": "onset_change_stool_form",
          "met": false
        },
        {
          "value": 2,
          "factor": "supporting_features_ge_2",
          "met": true
        }
      ],
      "rome_ii_ibs": true,
      "supporting_features_met": 2
    },
    {
      "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": "Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Müller-Lissner SA",
        "doi": "10.1136/gut.45.2008.ii43",
        "id": "thompson-1999",
        "pmid": "10457044",
        "source": "Gut. 1999;45 Suppl 2:II43-II47",
        "title": "Functional bowel disorders and functional abdominal pain"
      },
      "formula": "rome_ii_ibs",
      "formula_expression": "rome_ii_ibs iff pain_or_discomfort_12_weeks_of_12_months and supporting_features_met >= 2; supporting_features_met counts relieved_with_defecation, onset_change_stool_frequency, and onset_change_stool_form (Thompson 1999 Rome II IBS diagnostic criteria)",
      "criteria": [
        {
          "factor": "pain_or_discomfort_12_weeks_of_12_months",
          "met": true
        },
        {
          "factor": "relieved_with_defecation",
          "met": true
        },
        {
          "factor": "onset_change_stool_frequency",
          "met": true
        },
        {
          "factor": "onset_change_stool_form",
          "met": false
        },
        {
          "value": 2,
          "factor": "supporting_features_ge_2",
          "met": true
        }
      ],
      "rome_ii_ibs": true,
      "supporting_features_met": 2
    }
  ]
}

Response

Example JSON

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

{
  "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": "Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Müller-Lissner SA",
    "doi": "10.1136/gut.45.2008.ii43",
    "id": "thompson-1999",
    "pmid": "10457044",
    "source": "Gut. 1999;45 Suppl 2:II43-II47",
    "title": "Functional bowel disorders and functional abdominal pain"
  },
  "formula": "rome_ii_ibs",
  "formula_expression": "rome_ii_ibs iff pain_or_discomfort_12_weeks_of_12_months and supporting_features_met >= 2; supporting_features_met counts relieved_with_defecation, onset_change_stool_frequency, and onset_change_stool_form (Thompson 1999 Rome II IBS diagnostic criteria)",
  "criteria": [
    {
      "factor": "pain_or_discomfort_12_weeks_of_12_months",
      "met": true
    },
    {
      "factor": "relieved_with_defecation",
      "met": true
    },
    {
      "factor": "onset_change_stool_frequency",
      "met": true
    },
    {
      "factor": "onset_change_stool_form",
      "met": false
    },
    {
      "value": 2,
      "factor": "supporting_features_ge_2",
      "met": true
    }
  ],
  "rome_ii_ibs": true,
  "supporting_features_met": 2
}

Client errors (HTTP 400)

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

Related tools

• Rome III IBS — Apply the Longstreth 2006 Rome III IBS diagnostic criteria and return supporting_features_met (0-3) and whether the published IBS box holds (rome_iii_ibs).
• Rome IV IBS — Apply the Mearin 2016 Rome IV IBS diagnostic criteria and return supporting_features_met (0-3) and whether the published IBS box holds (rome_iv_ibs).

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.