{"uid":"cap_U-Q_rmSG7nUainuh5t564","slug":"rome-iv-h1a-child-adolescent-cyclic-vomiting-syndrome-checker-hyams-0f856a64","name":"Rome IV H1a Child/Adolescent Cyclic Vomiting Syndrome Checker (Hyams 2016)","description":"Hyams 2016 Rome IV H1a child/adolescent cyclic vomiting. rome_iv_child_cvs is true iff two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months, episodes_stereotypical, episodes_separated_weeks_to_months_with_return_to_baseline, and not_attributed_to_another_condition. Caller assigns four flags. magent does not examine the child. Not a diagnosis, not neonate/toddler G3, not adult Rome IV CVS, not cannabinoid hyperemesis.","url":"https://api.magentlab.com/api/calc/rome_iv_child_cvs","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months","episodes_stereotypical","episodes_separated_weeks_to_months_with_return_to_baseline","not_attributed_to_another_condition"],"properties":{"episodes_stereotypical":{"type":"boolean","description":"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."},"not_attributed_to_another_condition":{"type":"boolean","description":"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."},"episodes_separated_weeks_to_months_with_return_to_baseline":{"type":"boolean","description":"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."},"two_or_more_periods_intense_nausea_paroxysmal_vomiting_hours_to_days_within_6_months":{"type":"boolean","description":"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."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_IpAC9aua2PrlNB4QcVQTv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Applies the Rome IV H1a criteria (Hyams 2016) to determine whether a child or adolescent meets the diagnostic criteria for cyclic vomiting syndrome (CVS).","exampleAgentPrompt":"Check if this child meets Rome IV H1a cyclic vomiting syndrome criteria: they've had two or more episodes of intense nausea and paroxysmal vomiting lasting hours to days within 6 months (true), the episodes are stereotypical (true), they return to baseline health between episodes separated by weeks to months (true), and the symptoms have not been attributed to another condition (true).","exampleUseCases":[{"title":"Pediatric GI workup for recurrent vomiting","prompt":"My patient is a 10-year-old with repeated episodes of intense vomiting — they've had at least two episodes in the last 6 months, each episode looks the same, they recover fully between attacks, and workup hasn't found another cause. Do they meet Rome IV H1a criteria for cyclic vomiting syndrome?"},{"title":"Clinical documentation tool for CVS screening","prompt":"I'm documenting a case: the child has had stereotypical, paroxysmal vomiting episodes separated by weeks of normal health, occurring at least twice in 6 months, with no alternative diagnosis found. Run the Rome IV child CVS check for me — all four flags are true."},{"title":"Ruling out CVS when criteria are not fully met","prompt":"This adolescent has recurrent vomiting episodes that are stereotypical and occur within a 6-month period, but the episodes are not separated by a return to full baseline health. Can you run the Rome IV H1a CVS criteria to confirm they don't meet the threshold? The stereotypical flag is true, the 6-month flag is true, the return-to-baseline flag is false, and the not-attributed flag is true."}],"resultDescription":"Returns a boolean field rome_iv_child_cvs indicating whether all four Rome IV H1a criteria for child/adolescent cyclic vomiting syndrome are simultaneously satisfied. True only if all four caller-assigned flags are true; false otherwise. Does not provide a clinical diagnosis.","failureModes":["Missing required query parameter returns an error — all four boolean flags must be supplied","Misassignment of flags by the caller leads to incorrect logical output (endpoint trusts caller's clinical assessment)","Not applicable to neonates/toddlers (Rome IV G3 criteria differ), adults (adult Rome IV CVS criteria differ), or cannabinoid hyperemesis syndrome"],"whenToPreferThis":"Use this endpoint when you need to programmatically apply the Hyams 2016 Rome IV H1a criteria specifically for cyclic vomiting syndrome in children and adolescents, and the caller has already assessed the four clinical flags from clinical evaluation. Do not use for adult CVS (different Rome IV criteria), neonates/toddlers (Rome IV G3), or cannabinoid hyperemesis syndrome.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:02:17.987Z","isFirstParty":false}