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Rome IV child functional constipation

Rome IV Child Constipation

Apply the Hyams 2016 Rome IV H3a functional constipation (child/adolescent) criteria and return features_met and whether the published child constipation box holds (rome_iv_child_constipation).

LIVE $0.005 USDC GET /api/calc/rome_iv_child_constipation

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

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

What it computes

Apply the Hyams 2016 Rome IV H3a functional constipation (child/adolescent) criteria and return features_met and whether the published child constipation box holds (rome_iv_child_constipation).

When to use

When an agent already has the caller-assigned Hyams 2016 Rome IV H3a flags (developmental age at least 4 years, 1-month duration, the six constipation features, insufficient criteria for IBS, and not explained by another condition, including digital rectal exam as large_fecal_mass_in_rectum) and needs whether the published child/adolescent functional constipation box holds. magent does not examine the child.

When not to use

  • Not a medical device.
  • Not a diagnosis. magent does not diagnose child functional constipation.
  • The caller assigns the flags, including large_fecal_mass_in_rectum (digital rectal exam is caller-assigned). magent does not examine the child.
  • This tool is Hyams 2016 Rome IV H3a functional constipation (child/adolescent, developmental age at least 4 years) only. Not infant G7 (Benninga 2016). Not adult Rome IV FC (Mearin 2016 C2).
  • features_met always counts a fixed six-item list. Toilet-trained extras from G7 are not used. Weekly frequency is folded into the six feature flags (caller-assigned).

Formula

rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)

Citation

Title
Childhood Functional Gastrointestinal Disorders: Child/Adolescent
Authors
Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M
Source
Gastroenterology. 2016;150(6):1456-1468
DOI
10.1053/j.gastro.2016.02.015

Worked example

Age, duration, two of six features, insufficient IBS, not explained

Given: developmental_age_at_least_4_years=trueduration_at_least_1_month=truefecal_incontinence_at_least_weekly=falseinsufficient_criteria_for_ibs=truelarge_diameter_stools_that_can_obstruct_toilet=falselarge_fecal_mass_in_rectum=falsenot_explained_by_another_condition=truepainful_or_hard_bowel_movements=trueretentive_posturing_or_excessive_volitional_stool_retention=falsetwo_or_fewer_defecations_in_toilet_per_week=true

  1. developmental_age_at_least_4_years is true
  2. two_or_fewer_defecations_in_toilet_per_week and painful_or_hard_bowel_movements are true (2 of 6)
  3. duration_at_least_1_month is true
  4. insufficient_criteria_for_ibs is true
  5. not_explained_by_another_condition is true
  6. rome_iv_child_constipation is true

Worked example except insufficient criteria for IBS is false

Given: developmental_age_at_least_4_years=trueduration_at_least_1_month=truefecal_incontinence_at_least_weekly=falseinsufficient_criteria_for_ibs=falselarge_diameter_stools_that_can_obstruct_toilet=falselarge_fecal_mass_in_rectum=falsenot_explained_by_another_condition=truepainful_or_hard_bowel_movements=trueretentive_posturing_or_excessive_volitional_stool_retention=falsetwo_or_fewer_defecations_in_toilet_per_week=true

  1. developmental_age_at_least_4_years is true
  2. two_or_fewer_defecations_in_toilet_per_week and painful_or_hard_bowel_movements are true (2 of 6)
  3. duration_at_least_1_month is true
  4. insufficient_criteria_for_ibs is false
  5. not_explained_by_another_condition is true
  6. rome_iv_child_constipation is false

Also searched as

  • Rome IV child constipation
  • Hyams 2016 child constipation
  • Rome IV H3a
  • child adolescent functional constipation
  • pediatric functional constipation
  • H3a functional constipation
  • Rome IV H3a constipation
  • child constipation Rome IV

Try

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

/api/calc/rome_iv_child_constipation?developmental_age_at_least_4_years=true&two_or_fewer_defecations_in_toilet_per_week=true&fecal_incontinence_at_least_weekly=false&retentive_posturing_or_excessive_volitional_stool_retention=false&painful_or_hard_bowel_movements=true&large_fecal_mass_in_rectum=false&large_diameter_stools_that_can_obstruct_toilet=false&duration_at_least_1_month=true&insufficient_criteria_for_ibs=true&not_explained_by_another_condition=true

Full URL: https://api.magentlab.com/api/calc/rome_iv_child_constipation?developmental_age_at_least_4_years=true&two_or_fewer_defecations_in_toilet_per_week=true&fecal_incontinence_at_least_weekly=false&retentive_posturing_or_excessive_volitional_stool_retention=false&painful_or_hard_bowel_movements=true&large_fecal_mass_in_rectum=false&large_diameter_stools_that_can_obstruct_toilet=false&duration_at_least_1_month=true&insufficient_criteria_for_ibs=true&not_explained_by_another_condition=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_child_constipation?developmental_age_at_least_4_years=true&two_or_fewer_defecations_in_toilet_per_week=true&fecal_incontinence_at_least_weekly=false&retentive_posturing_or_excessive_volitional_stool_retention=false&painful_or_hard_bowel_movements=true&large_fecal_mass_in_rectum=false&large_diameter_stools_that_can_obstruct_toilet=false&duration_at_least_1_month=true&insufficient_criteria_for_ibs=true&not_explained_by_another_condition=true"

Parameters

Name Type Required Description
developmental_age_at_least_4_years boolean required Developmental age at least 4 years, as assigned (Hyams 2016 Rome IV H3a child/adolescent). true or false as assigned by the caller. magent does not examine the child.
two_or_fewer_defecations_in_toilet_per_week boolean required Two or fewer defecations in the toilet per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child.
fecal_incontinence_at_least_weekly boolean required At least one episode of fecal incontinence per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child.
retentive_posturing_or_excessive_volitional_stool_retention boolean required History of retentive posturing or excessive volitional stool retention, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child.
painful_or_hard_bowel_movements boolean required History of painful or hard bowel movements, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child.
large_fecal_mass_in_rectum boolean required Presence of a large fecal mass in the rectum, as assigned (Hyams 2016 Rome IV H3a; one of six features; digital rectal exam is caller-assigned). true or false as assigned by the caller. magent does not examine the child.
large_diameter_stools_that_can_obstruct_toilet boolean required History of large-diameter stools that can obstruct the toilet, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child.
duration_at_least_1_month boolean required Must include 1 month of at least 2 features occurring at least once per week, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child.
insufficient_criteria_for_ibs boolean required Insufficient criteria for irritable bowel syndrome, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child.
not_explained_by_another_condition boolean required After appropriate evaluation, the symptoms cannot be fully explained by another medical condition, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child.

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_child_constipation 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": [
    {
      "developmental_age_at_least_4_years": "true",
      "duration_at_least_1_month": "true",
      "fecal_incontinence_at_least_weekly": "false",
      "insufficient_criteria_for_ibs": "true",
      "large_diameter_stools_that_can_obstruct_toilet": "false",
      "large_fecal_mass_in_rectum": "false",
      "not_explained_by_another_condition": "true",
      "painful_or_hard_bowel_movements": "true",
      "retentive_posturing_or_excessive_volitional_stool_retention": "false",
      "two_or_fewer_defecations_in_toilet_per_week": "true"
    },
    {
      "developmental_age_at_least_4_years": "true",
      "duration_at_least_1_month": "true",
      "fecal_incontinence_at_least_weekly": "false",
      "insufficient_criteria_for_ibs": "true",
      "large_diameter_stools_that_can_obstruct_toilet": "false",
      "large_fecal_mass_in_rectum": "false",
      "not_explained_by_another_condition": "true",
      "painful_or_hard_bowel_movements": "true",
      "retentive_posturing_or_excessive_volitional_stool_retention": "false",
      "two_or_fewer_defecations_in_toilet_per_week": "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_child_constipation",
  "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": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M",
        "doi": "10.1053/j.gastro.2016.02.015",
        "id": "hyams-2016",
        "pmid": "27144632",
        "source": "Gastroenterology. 2016;150(6):1456-1468",
        "title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent"
      },
      "formula": "rome_iv_child_constipation",
      "formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
      "criteria": [
        {
          "factor": "developmental_age_at_least_4_years",
          "met": true
        },
        {
          "factor": "two_or_fewer_defecations_in_toilet_per_week",
          "met": true
        },
        {
          "factor": "fecal_incontinence_at_least_weekly",
          "met": false
        },
        {
          "factor": "retentive_posturing_or_excessive_volitional_stool_retention",
          "met": false
        },
        {
          "factor": "painful_or_hard_bowel_movements",
          "met": true
        },
        {
          "factor": "large_fecal_mass_in_rectum",
          "met": false
        },
        {
          "factor": "large_diameter_stools_that_can_obstruct_toilet",
          "met": false
        },
        {
          "factor": "duration_at_least_1_month",
          "met": true
        },
        {
          "value": 2,
          "factor": "features_ge_2",
          "met": true
        },
        {
          "factor": "insufficient_criteria_for_ibs",
          "met": true
        },
        {
          "factor": "not_explained_by_another_condition",
          "met": true
        }
      ],
      "features_met": 2,
      "rome_iv_child_constipation": true
    },
    {
      "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": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M",
        "doi": "10.1053/j.gastro.2016.02.015",
        "id": "hyams-2016",
        "pmid": "27144632",
        "source": "Gastroenterology. 2016;150(6):1456-1468",
        "title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent"
      },
      "formula": "rome_iv_child_constipation",
      "formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
      "criteria": [
        {
          "factor": "developmental_age_at_least_4_years",
          "met": true
        },
        {
          "factor": "two_or_fewer_defecations_in_toilet_per_week",
          "met": true
        },
        {
          "factor": "fecal_incontinence_at_least_weekly",
          "met": false
        },
        {
          "factor": "retentive_posturing_or_excessive_volitional_stool_retention",
          "met": false
        },
        {
          "factor": "painful_or_hard_bowel_movements",
          "met": true
        },
        {
          "factor": "large_fecal_mass_in_rectum",
          "met": false
        },
        {
          "factor": "large_diameter_stools_that_can_obstruct_toilet",
          "met": false
        },
        {
          "factor": "duration_at_least_1_month",
          "met": true
        },
        {
          "value": 2,
          "factor": "features_ge_2",
          "met": true
        },
        {
          "factor": "insufficient_criteria_for_ibs",
          "met": true
        },
        {
          "factor": "not_explained_by_another_condition",
          "met": true
        }
      ],
      "features_met": 2,
      "rome_iv_child_constipation": true
    }
  ]
}

Response

Field Type Description
formula string rome_iv_child_constipation
formula_expression string Hyams 2016 Rome IV H3a: developmental age at least 4 years, duration at least 1 month, at least 2 of 6 features, insufficient criteria for IBS, and not explained by another condition
features_met integer Count of true features among the six H3a flags. Toilet-trained extras from infant G7 are not used.
rome_iv_child_constipation boolean true only when developmental_age_at_least_4_years, duration_at_least_1_month, features_met >= 2, insufficient_criteria_for_ibs, and not_explained_by_another_condition. Not a diagnosis.
criteria array Per-factor rows with factor and met; features_ge_2 includes value (features_met)
citation object Hyams 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": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M",
    "doi": "10.1053/j.gastro.2016.02.015",
    "id": "hyams-2016",
    "pmid": "27144632",
    "source": "Gastroenterology. 2016;150(6):1456-1468",
    "title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent"
  },
  "formula": "rome_iv_child_constipation",
  "formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
  "criteria": [
    {
      "factor": "developmental_age_at_least_4_years",
      "met": true
    },
    {
      "factor": "two_or_fewer_defecations_in_toilet_per_week",
      "met": true
    },
    {
      "factor": "fecal_incontinence_at_least_weekly",
      "met": false
    },
    {
      "factor": "retentive_posturing_or_excessive_volitional_stool_retention",
      "met": false
    },
    {
      "factor": "painful_or_hard_bowel_movements",
      "met": true
    },
    {
      "factor": "large_fecal_mass_in_rectum",
      "met": false
    },
    {
      "factor": "large_diameter_stools_that_can_obstruct_toilet",
      "met": false
    },
    {
      "factor": "duration_at_least_1_month",
      "met": true
    },
    {
      "value": 2,
      "factor": "features_ge_2",
      "met": true
    },
    {
      "factor": "insufficient_criteria_for_ibs",
      "met": true
    },
    {
      "factor": "not_explained_by_another_condition",
      "met": true
    }
  ],
  "features_met": 2,
  "rome_iv_child_constipation": true
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_rome_iv_child_constipation Rome IV child functional constipation needs the Hyams 2016 child/adolescent H3a flags. Returned before settlement; you are not charged.
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 Infant Constipation — Apply the Benninga 2016 Rome IV G7 functional constipation (neonate/toddler) criteria and return features_met and whether the published infant constipation box holds (rome_iv_infant_constipation).
  • Rome IV child IBS — Apply the Hyams 2016 Rome IV H2b child/adolescent IBS diagnostic criteria and return stool_features_met (0-3) and whether the published H2b box holds (rome_iv_child_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.