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Rome IV child cyclic vomiting

Rome IV Child CVS

Apply the Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting syndrome diagnostic criteria and return whether the published child CVS box holds (rome_iv_child_cvs).

LIVE $0.005 USDC GET /api/calc/rome_iv_child_cvs

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

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

What it computes

Apply the Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting syndrome diagnostic criteria and return whether the published child CVS box holds (rome_iv_child_cvs).

When to use

When an agent already has the four caller-assigned Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting flags and needs whether the published child CVS box holds. magent does not examine the child.

When not to use

Not a medical device.
Not a diagnosis. magent does not diagnose cyclic vomiting syndrome.
The caller assigns the four flags. magent does not examine the child.
This tool is Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting syndrome only. Not neonate/toddler G3. Not adult Rome IV CVS (Stanghellini 2016 B3b). Not cannabinoid hyperemesis. History of migraine is not a required H1a flag and is not parsed. If abdominal pain predominates, consider abdominal migraine; that note is not a parsed flag.

Formula

rome_iv_child_cvs iff two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months and episodes_stereotypical and episodes_separated_weeks_to_months_with_return_to_baseline and not_attributed_to_another_condition (Hyams 2016 Rome IV H1a Cyclic Vomiting Syndrome)

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

All four required flags

Given: episodes_separated_weeks_to_months_with_return_to_baseline=trueepisodes_stereotypical=truenot_attributed_to_another_condition=truetwo_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months=true

Two or more periods of intense nausea and paroxysmal vomiting lasting hours to days within 6 months is true
Episodes are stereotypical is true
Episodes separated by weeks to months with return to baseline is true
Not attributed to another condition is true
rome_iv_child_cvs is true

Three flags without not attributed to another condition

Given: episodes_separated_weeks_to_months_with_return_to_baseline=trueepisodes_stereotypical=truenot_attributed_to_another_condition=falsetwo_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months=true

Two or more periods of intense nausea and paroxysmal vomiting lasting hours to days within 6 months is true
Episodes are stereotypical is true
Episodes separated by weeks to months with return to baseline is true
Not attributed to another condition is false
rome_iv_child_cvs is false

Also searched as

Rome IV child cyclic vomiting
Hyams 2016 cyclic vomiting
Rome IV H1a
child adolescent cyclic vomiting
pediatric cyclic vomiting Rome IV
Hyams H1a CVS
Rome IV child CVS
cyclic vomiting syndrome child

Try

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

/api/calc/rome_iv_child_cvs?two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months=true&episodes_stereotypical=true&episodes_separated_weeks_to_months_with_return_to_baseline=true&not_attributed_to_another_condition=true

Full URL: https://api.magentlab.com/api/calc/rome_iv_child_cvs?two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months=true&episodes_stereotypical=true&episodes_separated_weeks_to_months_with_return_to_baseline=true&not_attributed_to_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_cvs?two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months=true&episodes_stereotypical=true&episodes_separated_weeks_to_months_with_return_to_baseline=true&not_attributed_to_another_condition=true"

Parameters

Name	Type	Required	Description
`two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months`	boolean	required	Two or more periods of intense, unremitting nausea and paroxysmal vomiting lasting hours to days within a 6-month period, as assigned (Hyams 2016 Rome IV H1a). true or false as assigned by the caller. magent does not examine the child.
`episodes_stereotypical`	boolean	required	Episodes are stereotypical in each patient, as assigned (Hyams 2016 Rome IV H1a). true or false as assigned by the caller. magent does not examine the child.
`episodes_separated_weeks_to_months_with_return_to_baseline`	boolean	required	Episodes are separated by weeks to months with return to baseline health between episodes, as assigned (Hyams 2016 Rome IV H1a). true or false as assigned by the caller. magent does not examine the child.
`not_attributed_to_another_condition`	boolean	required	After appropriate medical evaluation, the symptoms cannot be attributed to another condition, as assigned (Hyams 2016 Rome IV H1a). 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_cvs 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": [
    {
      "episodes_separated_weeks_to_months_with_return_to_baseline": "true",
      "episodes_stereotypical": "true",
      "not_attributed_to_another_condition": "true",
      "two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months": "true"
    },
    {
      "episodes_separated_weeks_to_months_with_return_to_baseline": "true",
      "episodes_stereotypical": "true",
      "not_attributed_to_another_condition": "true",
      "two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months": "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_cvs",
  "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_cvs",
      "formula_expression": "rome_iv_child_cvs iff two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months and episodes_stereotypical and episodes_separated_weeks_to_months_with_return_to_baseline and not_attributed_to_another_condition (Hyams 2016 Rome IV H1a Cyclic Vomiting Syndrome)",
      "criteria": [
        {
          "factor": "two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months",
          "met": true
        },
        {
          "factor": "episodes_stereotypical",
          "met": true
        },
        {
          "factor": "episodes_separated_weeks_to_months_with_return_to_baseline",
          "met": true
        },
        {
          "factor": "not_attributed_to_another_condition",
          "met": true
        }
      ],
      "rome_iv_child_cvs": 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_cvs",
      "formula_expression": "rome_iv_child_cvs iff two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months and episodes_stereotypical and episodes_separated_weeks_to_months_with_return_to_baseline and not_attributed_to_another_condition (Hyams 2016 Rome IV H1a Cyclic Vomiting Syndrome)",
      "criteria": [
        {
          "factor": "two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months",
          "met": true
        },
        {
          "factor": "episodes_stereotypical",
          "met": true
        },
        {
          "factor": "episodes_separated_weeks_to_months_with_return_to_baseline",
          "met": true
        },
        {
          "factor": "not_attributed_to_another_condition",
          "met": true
        }
      ],
      "rome_iv_child_cvs": true
    }
  ]
}

Response

Field	Type	Description
`formula`	string	rome_iv_child_cvs
`formula_expression`	string	Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting: two or more periods of intense nausea and paroxysmal vomiting lasting hours to days within 6 months, stereotypical episodes, weeks-to-months separation with return to baseline, and not attributed to another condition
`rome_iv_child_cvs`	boolean	true only when all four required flags hold. Not a diagnosis.
`criteria`	array	Per-factor rows with factor and met for the four required flags
`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_cvs",
  "formula_expression": "rome_iv_child_cvs iff two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months and episodes_stereotypical and episodes_separated_weeks_to_months_with_return_to_baseline and not_attributed_to_another_condition (Hyams 2016 Rome IV H1a Cyclic Vomiting Syndrome)",
  "criteria": [
    {
      "factor": "two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months",
      "met": true
    },
    {
      "factor": "episodes_stereotypical",
      "met": true
    },
    {
      "factor": "episodes_separated_weeks_to_months_with_return_to_baseline",
      "met": true
    },
    {
      "factor": "not_attributed_to_another_condition",
      "met": true
    }
  ],
  "rome_iv_child_cvs": 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_cvs`	Rome IV child cyclic vomiting needs the Hyams 2016 child/adolescent H1a 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 CVS — Apply the Stanghellini 2016 Rome IV adult cyclic vomiting syndrome B3b diagnostic criteria and return whether the published CVS box holds (rome_iv_cvs) plus the supportive migraine_history flag.
Rome IV Child Rumination — Apply the Hyams 2016 Rome IV H1c child/adolescent rumination syndrome diagnostic criteria and return whether the published rumination box holds (rome_iv_child_rumination).

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.