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Rome IV Cyclic Vomiting Syndrome (CVS) Criteria Calculator
x402
Rome IV Cyclic Vomiting Syndrome (CVS) Criteria Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Evaluates eight boolean clinical flags against the Stanghellini 2016 Rome IV B3b criteria to determine whether a patient meets the diagnostic criteria for adult cyclic vomiting syndrome (CVS).
Price / call$0.005
Success—
StatusUnknown
How this service works
Stanghellini 2016 Rome IV adult CVS B3b. rome_iv_cvs is true iff stereotypical acute vomiting episodes lasting <1 week, ≥3 discrete episodes in the prior year and 2 in 6 months at least 1 week apart, absence of vomiting between episodes, last-3-months criteria, and 6-month onset. migraine_history is supportive and not required. Caller assigns eight flags. magent does not examine the patient. Not a diagnosis, not CHS, not pediatric CVS, not Rome IV IBS.
Output
Returns a boolean field rome_iv_cvs indicating whether all required Rome IV B3b CVS criteria are satisfied (true) or not (false), along with the migraine_history supportive criterion. Does not provide a diagnosis; caller is responsible for clinical interpretation.
Example use cases
GI clinic CVS screening workflow
“I need to check Rome IV B3b CVS criteria for a patient: stereotypical acute vomiting episodes yes, each lasting under a week, 3 episodes in the prior year, 2 episodes in the past 6 months at least 1 week apart, no vomiting between episodes, criteria met for the last 3 months, onset over 6 months ago, and no migraine history — do they meet Rome IV CVS?”
EMR-integrated diagnostic rule-out
“Run the Stanghellini 2016 Rome IV CVS calculator for me — the patient has stereotypical episodes: true, under 1 week duration: true, 3 episodes prior year: true, 2 episodes past 6 months: true, at least 1 week apart: true, no vomiting between episodes: true, last 3 months fulfilled: false, 6-month onset: true, migraine history: false. What does it return?”
Clinical research eligibility check
“I'm screening research participants for adult CVS per Rome IV B3b — check these flags: stereotypical acute episodes yes, duration under 1 week yes, three or more episodes in the prior year yes, two in the past 6 months yes, at least a week apart yes, asymptomatic between episodes yes, criteria met in the last 3 months yes, onset at least 6 months ago yes, migraine history yes. Do they qualify?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/rome_iv_cvsWhen to prefer
Use this endpoint when you need a fast, rule-based computation of whether a set of pre-assessed clinical boolean flags satisfies the Stanghellini 2016 Rome IV B3b adult CVS criteria. It is not a substitute for clinical judgment, history-taking, or differential diagnosis. Prefer this over manual criteria lookup when building clinical decision support tools, EMR integrations, or research screening pipelines that require consistent, auditable rule application.
Side effects
- Missing required boolean query parameters returns a validation error
- Misassignment of flags by caller leads to incorrect result — the endpoint trusts all inputs as provided
- Pediatric CVS, CHS (cannabinoid hyperemesis syndrome), and Rome IV IBS are explicitly out of scope
- Network errors or payment failures (x402) result in no response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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