# Rome IV H1d child aerophagia

Rome IV child aerophagia

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/rome_iv_child_aerophagia`
HTML: https://magentlab.com/docs/rome-iv-child-aerophagia
Markdown: https://magentlab.com/docs/rome-iv-child-aerophagia.md

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

## What it computes

Apply the Hyams 2016 Rome IV H1d child/adolescent aerophagia diagnostic criteria and return whether the published aerophagia box holds (rome_iv_child_aerophagia).

## When to use

When an agent already has the five caller-assigned Hyams 2016 Rome IV H1d aerophagia flags and needs whether the published child aerophagia box holds. magent does not examine the patient.

## When not to use

- Not a medical device.
- Not a diagnosis. magent does not diagnose child aerophagia.
- The caller assigns the five flags. Distention includes increases during the day in that one flag. Belching or increased flatus is one flag. magent does not examine the patient.
- This tool is Hyams 2016 Rome IV H1d child/adolescent aerophagia only. All three symptom criteria are required. Not adult belching disorders (impedance). Not infant regurgitation.

## Formula

```
rome_iv_child_aerophagia iff excessive_air_swallowing and abdominal_distention_intraluminal_air_increases_during_day and repetitive_belching_and_or_increased_flatus and not_explained_by_another_condition and fulfilled_at_least_2_months (Hyams 2016 Rome IV H1d aerophagia)
```

## Citation

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

## Worked example

### All five required flags

Given: `abdominal_distention_intraluminal_air_increases_during_day=true, excessive_air_swallowing=true, fulfilled_at_least_2_months=true, not_explained_by_another_condition=true, repetitive_belching_and_or_increased_flatus=true`

1. Excessive air swallowing is true
2. Abdominal distention due to intraluminal air that increases during the day is true
3. Repetitive belching and/or increased flatus is true
4. Not explained by another condition is true
5. Fulfilled at least 2 months is true
6. rome_iv_child_aerophagia is true


### Four required flags without 2-month duration

Given: `abdominal_distention_intraluminal_air_increases_during_day=true, excessive_air_swallowing=true, fulfilled_at_least_2_months=false, not_explained_by_another_condition=true, repetitive_belching_and_or_increased_flatus=true`

1. Excessive air swallowing is true
2. Abdominal distention due to intraluminal air that increases during the day is true
3. Repetitive belching and/or increased flatus is true
4. Not explained by another condition is true
5. Fulfilled at least 2 months is false
6. rome_iv_child_aerophagia is false


## Also searched as

- Rome IV child aerophagia
- Hyams 2016 aerophagia
- Rome IV H1d
- child aerophagia criteria
- pediatric aerophagia
- H1d aerophagia
- childhood functional aerophagia
- Rome IV child adolescent aerophagia

## Parameters

- `excessive_air_swallowing` (boolean, required): Excessive air swallowing, as assigned (Hyams 2016 Rome IV H1d). true or false as assigned by the caller. magent does not examine the patient.
- `abdominal_distention_intraluminal_air_increases_during_day` (boolean, required): Abdominal distention due to intraluminal air that increases during the day, as assigned (Hyams 2016 Rome IV H1d). Distention and increases-during-the-day are one flag. true or false as assigned by the caller. magent does not examine the patient.
- `repetitive_belching_and_or_increased_flatus` (boolean, required): Repetitive belching and/or increased flatus, as assigned (Hyams 2016 Rome IV H1d). Belching or increased flatus is one caller-assigned flag. true or false as assigned by the caller. magent does not examine the patient.
- `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 H1d). true or false as assigned by the caller. magent does not examine the patient.
- `fulfilled_at_least_2_months` (boolean, required): Criteria fulfilled for at least 2 months, as assigned (Hyams 2016 Rome IV H1d). true or false as assigned by the caller. magent does not take a history.

## 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.

Method: `POST /api/calc/rome_iv_child_aerophagia`
Max items: 25
Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic)
Status: 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:

```json
{
  "items": [
    {
      "abdominal_distention_intraluminal_air_increases_during_day": "true",
      "excessive_air_swallowing": "true",
      "fulfilled_at_least_2_months": "true",
      "not_explained_by_another_condition": "true",
      "repetitive_belching_and_or_increased_flatus": "true"
    },
    {
      "abdominal_distention_intraluminal_air_increases_during_day": "true",
      "excessive_air_swallowing": "true",
      "fulfilled_at_least_2_months": "true",
      "not_explained_by_another_condition": "true",
      "repetitive_belching_and_or_increased_flatus": "true"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/rome-iv-child-aerophagia

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/rome_iv_child_aerophagia",
  "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_aerophagia",
      "formula_expression": "rome_iv_child_aerophagia iff excessive_air_swallowing and abdominal_distention_intraluminal_air_increases_during_day and repetitive_belching_and_or_increased_flatus and not_explained_by_another_condition and fulfilled_at_least_2_months (Hyams 2016 Rome IV H1d aerophagia)",
      "criteria": [
        {
          "factor": "excessive_air_swallowing",
          "met": true
        },
        {
          "factor": "abdominal_distention_intraluminal_air_increases_during_day",
          "met": true
        },
        {
          "factor": "repetitive_belching_and_or_increased_flatus",
          "met": true
        },
        {
          "factor": "not_explained_by_another_condition",
          "met": true
        },
        {
          "factor": "fulfilled_at_least_2_months",
          "met": true
        }
      ],
      "rome_iv_child_aerophagia": 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_aerophagia",
      "formula_expression": "rome_iv_child_aerophagia iff excessive_air_swallowing and abdominal_distention_intraluminal_air_increases_during_day and repetitive_belching_and_or_increased_flatus and not_explained_by_another_condition and fulfilled_at_least_2_months (Hyams 2016 Rome IV H1d aerophagia)",
      "criteria": [
        {
          "factor": "excessive_air_swallowing",
          "met": true
        },
        {
          "factor": "abdominal_distention_intraluminal_air_increases_during_day",
          "met": true
        },
        {
          "factor": "repetitive_belching_and_or_increased_flatus",
          "met": true
        },
        {
          "factor": "not_explained_by_another_condition",
          "met": true
        },
        {
          "factor": "fulfilled_at_least_2_months",
          "met": true
        }
      ],
      "rome_iv_child_aerophagia": true
    }
  ]
}
```

## Response fields

- `formula` (string): rome_iv_child_aerophagia
- `formula_expression` (string): Hyams 2016 Rome IV H1d aerophagia: excessive air swallowing, abdominal distention due to intraluminal air that increases during the day, repetitive belching and/or increased flatus, not explained by another condition, and fulfilled at least 2 months
- `rome_iv_child_aerophagia` (boolean): true only when all five required flags hold. Not a diagnosis.
- `criteria` (array): Per-factor rows with factor and met for the five required flags
- `citation` (object): Hyams 2016 Gastroenterology citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "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_aerophagia",
  "formula_expression": "rome_iv_child_aerophagia iff excessive_air_swallowing and abdominal_distention_intraluminal_air_increases_during_day and repetitive_belching_and_or_increased_flatus and not_explained_by_another_condition and fulfilled_at_least_2_months (Hyams 2016 Rome IV H1d aerophagia)",
  "criteria": [
    {
      "factor": "excessive_air_swallowing",
      "met": true
    },
    {
      "factor": "abdominal_distention_intraluminal_air_increases_during_day",
      "met": true
    },
    {
      "factor": "repetitive_belching_and_or_increased_flatus",
      "met": true
    },
    {
      "factor": "not_explained_by_another_condition",
      "met": true
    },
    {
      "factor": "fulfilled_at_least_2_months",
      "met": true
    }
  ],
  "rome_iv_child_aerophagia": true
}
```

## Errors

- HTTP 400 `invalid_rome_iv_child_aerophagia`: Rome IV child aerophagia needs the Hyams 2016 child/adolescent H1d flags. Returned before settlement; you are not charged.
- HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.

Shared HTTP 402 and 503: https://magentlab.com/docs/payments

## Related tools

- [Rome IV Child Rumination](https://magentlab.com/docs/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).
- [Rome IV infant regurgitation](https://magentlab.com/docs/rome-iv-infant-regurgitation) — Apply the Benninga 2016 Rome IV G1 infant regurgitation diagnostic criteria and return whether the published infant-regurgitation box holds (rome_iv_infant_regurgitation).

## 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.

- GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall).
- HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote.
- Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional.
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402.

- offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront.
- offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization.

- not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search.

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers).

Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments

Stdio MCP (one process per host): https://magentlab.com/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.