MAGENT

GI · LIVE

Rome IV functional constipation

Rome IV FC

Apply the Mearin 2016 Rome IV C2 functional constipation criteria and return symptom_count (0-6) and whether the published C2 box holds (rome_iv_fc).

LIVE $0.005 USDC GET /api/calc/rome_iv_fc

Markdown: /docs/rome-iv-fc.md · Canonical: https://magentlab.com/docs/rome-iv-fc

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

What it computes

Apply the Mearin 2016 Rome IV C2 functional constipation criteria and return symptom_count (0-6) and whether the published C2 box holds (rome_iv_fc).

When to use

When an agent already has the nine caller-assigned Rome IV C2 flags as in Mearin 2016 and needs whether the published functional constipation box holds. magent does not examine the patient.

When not to use

  • Not a medical device.
  • Not a diagnosis. magent does not diagnose functional constipation.
  • The caller assigns the nine flags. magent does not examine the patient.
  • This tool is adult Rome IV C2 functional constipation only. Not Rome IV IBS (Mearin 2016 IBS box), not Manning, not opioid-induced constipation as a separate diagnosis, and not child functional constipation.

Formula

rome_iv_fc iff criteria_last_3_months_onset_6_months and symptom_count >= 2 and loose_stools_rare_without_laxatives and insufficient_criteria_for_ibs; symptom_count counts straining_gt_25_percent, lumpy_or_hard_stools_gt_25_percent, incomplete_evacuation_gt_25_percent, anorectal_obstruction_gt_25_percent, manual_maneuvers_gt_25_percent, and fewer_than_3_sbm_per_week (Mearin 2016 Rome IV C2 functional constipation)

Citation

Title
Bowel Disorders
Authors
Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, Spiller RC
Source
Gastroenterology. 2016;150(6):1393-1407
DOI
10.1053/j.gastro.2016.02.031

Worked example

Timing, two of six symptoms, rare loose stools, and not IBS

Given: anorectal_obstruction_gt_25_percent=falsecriteria_last_3_months_onset_6_months=truefewer_than_3_sbm_per_week=trueincomplete_evacuation_gt_25_percent=falseinsufficient_criteria_for_ibs=trueloose_stools_rare_without_laxatives=truelumpy_or_hard_stools_gt_25_percent=falsemanual_maneuvers_gt_25_percent=falsestraining_gt_25_percent=true

  1. Criteria fulfilled for the last 3 months with onset at least 6 months prior is true
  2. Straining more than 25% of defecations and fewer than 3 spontaneous bowel movements per week are true; the other four symptom items are false (2 of 6)
  3. Loose stools rarely present without laxatives is true
  4. Insufficient criteria for IBS is true
  5. rome_iv_fc is true

Timing, rare loose stools, and not IBS with only one symptom

Given: anorectal_obstruction_gt_25_percent=falsecriteria_last_3_months_onset_6_months=truefewer_than_3_sbm_per_week=falseincomplete_evacuation_gt_25_percent=falseinsufficient_criteria_for_ibs=trueloose_stools_rare_without_laxatives=truelumpy_or_hard_stools_gt_25_percent=falsemanual_maneuvers_gt_25_percent=falsestraining_gt_25_percent=true

  1. Timing, rare loose stools without laxatives, and insufficient IBS criteria hold
  2. Only straining is true (1 of 6)
  3. rome_iv_fc is false

Also searched as

  • Rome IV functional constipation
  • Rome IV C2
  • Mearin 2016 constipation
  • functional constipation criteria
  • Rome IV FC
  • adult functional constipation
  • constipation Rome IV
  • Mearin C2 functional constipation

Try

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

/api/calc/rome_iv_fc?criteria_last_3_months_onset_6_months=true&straining_gt_25_percent=true&lumpy_or_hard_stools_gt_25_percent=false&incomplete_evacuation_gt_25_percent=false&anorectal_obstruction_gt_25_percent=false&manual_maneuvers_gt_25_percent=false&fewer_than_3_sbm_per_week=true&loose_stools_rare_without_laxatives=true&insufficient_criteria_for_ibs=true

Full URL: https://api.magentlab.com/api/calc/rome_iv_fc?criteria_last_3_months_onset_6_months=true&straining_gt_25_percent=true&lumpy_or_hard_stools_gt_25_percent=false&incomplete_evacuation_gt_25_percent=false&anorectal_obstruction_gt_25_percent=false&manual_maneuvers_gt_25_percent=false&fewer_than_3_sbm_per_week=true&loose_stools_rare_without_laxatives=true&insufficient_criteria_for_ibs=true

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_iv_fc?criteria_last_3_months_onset_6_months=true&straining_gt_25_percent=true&lumpy_or_hard_stools_gt_25_percent=false&incomplete_evacuation_gt_25_percent=false&anorectal_obstruction_gt_25_percent=false&manual_maneuvers_gt_25_percent=false&fewer_than_3_sbm_per_week=true&loose_stools_rare_without_laxatives=true&insufficient_criteria_for_ibs=true"

Parameters

Name Type Required Description
criteria_last_3_months_onset_6_months boolean required Criteria fulfilled for the last 3 months with symptom onset at least 6 months prior to diagnosis, as assigned (Mearin 2016 C2). true or false as assigned by the caller. magent does not take a history.
straining_gt_25_percent boolean required Straining during more than 25% of defecations (one of six C2 symptom items; at least two required). true or false as assigned by the caller. magent does not examine the patient.
lumpy_or_hard_stools_gt_25_percent boolean required Lumpy or hard stools (Bristol stool form types 1-2) more than 25% of defecations (one of six C2 symptom items; at least two required). true or false as assigned by the caller. magent does not inspect stool.
incomplete_evacuation_gt_25_percent boolean required Sensation of incomplete evacuation more than 25% of defecations (one of six C2 symptom items; at least two required). true or false as assigned by the caller.
anorectal_obstruction_gt_25_percent boolean required Sensation of anorectal obstruction/blockage more than 25% of defecations (one of six C2 symptom items; at least two required). true or false as assigned by the caller.
manual_maneuvers_gt_25_percent boolean required Manual maneuvers to facilitate more than 25% of defecations (one of six C2 symptom items; at least two required). true or false as assigned by the caller.
fewer_than_3_sbm_per_week boolean required Fewer than three spontaneous bowel movements per week (one of six C2 symptom items; at least two required). true or false as assigned by the caller.
loose_stools_rare_without_laxatives boolean required Loose stools are rarely present without the use of laxatives, as assigned (Mearin 2016 C2). true or false as assigned by the caller. magent does not examine the patient.
insufficient_criteria_for_ibs boolean required Insufficient criteria for irritable bowel syndrome, as assigned by the caller (Mearin 2016 C2 requires IBS criteria are not met). true or false. magent does not apply the IBS box.

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_iv_fc 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": [
    {
      "anorectal_obstruction_gt_25_percent": "false",
      "criteria_last_3_months_onset_6_months": "true",
      "fewer_than_3_sbm_per_week": "true",
      "incomplete_evacuation_gt_25_percent": "false",
      "insufficient_criteria_for_ibs": "true",
      "loose_stools_rare_without_laxatives": "true",
      "lumpy_or_hard_stools_gt_25_percent": "false",
      "manual_maneuvers_gt_25_percent": "false",
      "straining_gt_25_percent": "true"
    },
    {
      "anorectal_obstruction_gt_25_percent": "false",
      "criteria_last_3_months_onset_6_months": "true",
      "fewer_than_3_sbm_per_week": "true",
      "incomplete_evacuation_gt_25_percent": "false",
      "insufficient_criteria_for_ibs": "true",
      "loose_stools_rare_without_laxatives": "true",
      "lumpy_or_hard_stools_gt_25_percent": "false",
      "manual_maneuvers_gt_25_percent": "false",
      "straining_gt_25_percent": "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_iv_fc",
  "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": "Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, Spiller RC",
        "doi": "10.1053/j.gastro.2016.02.031",
        "id": "mearin-2016",
        "pmid": "27144627",
        "source": "Gastroenterology. 2016;150(6):1393-1407",
        "title": "Bowel Disorders"
      },
      "formula": "rome_iv_fc",
      "formula_expression": "rome_iv_fc iff criteria_last_3_months_onset_6_months and symptom_count >= 2 and loose_stools_rare_without_laxatives and insufficient_criteria_for_ibs; symptom_count counts straining_gt_25_percent, lumpy_or_hard_stools_gt_25_percent, incomplete_evacuation_gt_25_percent, anorectal_obstruction_gt_25_percent, manual_maneuvers_gt_25_percent, and fewer_than_3_sbm_per_week (Mearin 2016 Rome IV C2 functional constipation)",
      "criteria": [
        {
          "factor": "criteria_last_3_months_onset_6_months",
          "met": true
        },
        {
          "factor": "straining_gt_25_percent",
          "met": true
        },
        {
          "factor": "lumpy_or_hard_stools_gt_25_percent",
          "met": false
        },
        {
          "factor": "incomplete_evacuation_gt_25_percent",
          "met": false
        },
        {
          "factor": "anorectal_obstruction_gt_25_percent",
          "met": false
        },
        {
          "factor": "manual_maneuvers_gt_25_percent",
          "met": false
        },
        {
          "factor": "fewer_than_3_sbm_per_week",
          "met": true
        },
        {
          "value": 2,
          "factor": "symptom_count_ge_2",
          "met": true
        },
        {
          "factor": "loose_stools_rare_without_laxatives",
          "met": true
        },
        {
          "factor": "insufficient_criteria_for_ibs",
          "met": true
        }
      ],
      "rome_iv_fc": true,
      "symptom_count": 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": "Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, Spiller RC",
        "doi": "10.1053/j.gastro.2016.02.031",
        "id": "mearin-2016",
        "pmid": "27144627",
        "source": "Gastroenterology. 2016;150(6):1393-1407",
        "title": "Bowel Disorders"
      },
      "formula": "rome_iv_fc",
      "formula_expression": "rome_iv_fc iff criteria_last_3_months_onset_6_months and symptom_count >= 2 and loose_stools_rare_without_laxatives and insufficient_criteria_for_ibs; symptom_count counts straining_gt_25_percent, lumpy_or_hard_stools_gt_25_percent, incomplete_evacuation_gt_25_percent, anorectal_obstruction_gt_25_percent, manual_maneuvers_gt_25_percent, and fewer_than_3_sbm_per_week (Mearin 2016 Rome IV C2 functional constipation)",
      "criteria": [
        {
          "factor": "criteria_last_3_months_onset_6_months",
          "met": true
        },
        {
          "factor": "straining_gt_25_percent",
          "met": true
        },
        {
          "factor": "lumpy_or_hard_stools_gt_25_percent",
          "met": false
        },
        {
          "factor": "incomplete_evacuation_gt_25_percent",
          "met": false
        },
        {
          "factor": "anorectal_obstruction_gt_25_percent",
          "met": false
        },
        {
          "factor": "manual_maneuvers_gt_25_percent",
          "met": false
        },
        {
          "factor": "fewer_than_3_sbm_per_week",
          "met": true
        },
        {
          "value": 2,
          "factor": "symptom_count_ge_2",
          "met": true
        },
        {
          "factor": "loose_stools_rare_without_laxatives",
          "met": true
        },
        {
          "factor": "insufficient_criteria_for_ibs",
          "met": true
        }
      ],
      "rome_iv_fc": true,
      "symptom_count": 2
    }
  ]
}

Response

Field Type Description
formula string rome_iv_fc
formula_expression string Mearin 2016 Rome IV C2: last 3 months with 6-month onset, at least 2 of 6 symptoms, rare loose stools without laxatives, and insufficient IBS criteria
symptom_count integer Count of true C2 symptom items among straining, lumpy or hard stools, incomplete evacuation, anorectal obstruction, manual maneuvers, and fewer than 3 spontaneous bowel movements per week (0-6)
rome_iv_fc boolean true only when timing, at least two of six symptoms, rare loose stools without laxatives, and insufficient IBS criteria all hold. Not a diagnosis.
criteria array Per-factor rows with factor and met; symptom_count_ge_2 includes value 0-6
citation object Mearin 2016 Gastroenterology citation
disclaimer string Not-a-device notice

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": "Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, Spiller RC",
    "doi": "10.1053/j.gastro.2016.02.031",
    "id": "mearin-2016",
    "pmid": "27144627",
    "source": "Gastroenterology. 2016;150(6):1393-1407",
    "title": "Bowel Disorders"
  },
  "formula": "rome_iv_fc",
  "formula_expression": "rome_iv_fc iff criteria_last_3_months_onset_6_months and symptom_count >= 2 and loose_stools_rare_without_laxatives and insufficient_criteria_for_ibs; symptom_count counts straining_gt_25_percent, lumpy_or_hard_stools_gt_25_percent, incomplete_evacuation_gt_25_percent, anorectal_obstruction_gt_25_percent, manual_maneuvers_gt_25_percent, and fewer_than_3_sbm_per_week (Mearin 2016 Rome IV C2 functional constipation)",
  "criteria": [
    {
      "factor": "criteria_last_3_months_onset_6_months",
      "met": true
    },
    {
      "factor": "straining_gt_25_percent",
      "met": true
    },
    {
      "factor": "lumpy_or_hard_stools_gt_25_percent",
      "met": false
    },
    {
      "factor": "incomplete_evacuation_gt_25_percent",
      "met": false
    },
    {
      "factor": "anorectal_obstruction_gt_25_percent",
      "met": false
    },
    {
      "factor": "manual_maneuvers_gt_25_percent",
      "met": false
    },
    {
      "factor": "fewer_than_3_sbm_per_week",
      "met": true
    },
    {
      "value": 2,
      "factor": "symptom_count_ge_2",
      "met": true
    },
    {
      "factor": "loose_stools_rare_without_laxatives",
      "met": true
    },
    {
      "factor": "insufficient_criteria_for_ibs",
      "met": true
    }
  ],
  "rome_iv_fc": true,
  "symptom_count": 2
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_flag boolean clinical flags must be true or false 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

  • 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).
  • Bristol stool — Return the Lewis 1997 Bristol stool form scale type 1-7 from a caller-assigned integer, with the published form wording.
  • Manning — Count the six Manning 1978 IBS symptoms and return the integer score (0-6). Manning 1978 does not publish a diagnostic cutoff.

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.