# Rome IV child functional constipation Rome IV Child Constipation Status: LIVE Price: $0.005 USDC `GET /api/calc/rome_iv_child_constipation` HTML: https://magentlab.com/docs/rome-iv-child-constipation Markdown: https://magentlab.com/docs/rome-iv-child-constipation.md 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 [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 ### Age, duration, two of six features, insufficient IBS, not explained Given: `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` 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=true, duration_at_least_1_month=true, fecal_incontinence_at_least_weekly=false, insufficient_criteria_for_ibs=false, 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` 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 ## Parameters - `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. Method: `POST /api/calc/rome_iv_child_constipation` 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": [ { "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" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/rome-iv-child-constipation Example 200: ```json { "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 fields - `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 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_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 } ``` ## Errors - HTTP 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. - 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 Infant Constipation](https://magentlab.com/docs/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](https://magentlab.com/docs/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. - 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.