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RIPASA Score Calculator
x402
RIPASA Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Computes the Chong 2010 RIPASA appendicitis scoring from 15 caller-assigned clinical findings, returning a numeric score and cutoff classification.
Price / call$0.005
Success—
StatusUnknown
How this service works
Chong 2010 RIPASA score from 15 caller-assigned findings (half-points; max 16). Age <40 scores 1.0, ≥40 scores 0.5; male 1.0, female 0.5; symptoms <48h 1.0, otherwise 0.5. Guarding and Rovsing 2.0 each. Fever, raised WCC, and foreign NRIC are caller-assigned; magent does not apply a °C or WBC cutoff. Derivation ROC: <7.5 below_cutoff, ≥7.5 at_or_above_cutoff. Not a diagnosis or operating-room protocol. magent does not examine the abdomen.
Output
Returns a numeric RIPASA total score (half-point increments, maximum 16) and a cutoff classification: 'below_cutoff' if the score is less than 7.5 or 'at_or_above_cutoff' if the score is 7.5 or higher, based on the Chong 2010 derivation ROC threshold.
Example use cases
ED triage for suspected appendicitis
“I need a RIPASA score for a 28-year-old female presenting to the ED with right iliac fossa pain, migration to RIF, vomiting, anorexia, symptoms started 30 hours ago, RIF tenderness, no guarding, rebound tenderness present, Rovsing sign negative, fever flagged, WCC not raised, urinalysis negative, and no foreign NRIC.”
Post-labs scoring update
“My 45-year-old male patient has RIF pain, no migration, nausea, no anorexia, symptoms over 48 hours, RIF tenderness, guarding present, no rebound tenderness, Rovsing sign positive, fever flagged, raised WCC flagged by the lab, urinalysis negative, no foreign NRIC — what does his RIPASA score come out to?”
Junior doctor clinical audit workflow
“For audit purposes, compute the RIPASA scores for this case: 19-year-old female, RIF pain positive, migration positive, nausea positive, anorexia positive, symptoms less than 48 hours, RIF tenderness positive, no guarding, no rebound tenderness, Rovsing negative, no fever, raised WCC flagged, urinalysis negative, foreign NRIC flagged — is she above or below the 7.5 cutoff?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/ripasaWhen to prefer
Use this endpoint when you need a reproducible, deterministic RIPASA arithmetic computation from caller-supplied clinical findings and do not need the API to interpret vitals, read lab values, or perform physical examination — all 15 inputs must be pre-assessed by the caller. Prefer this over general LLM-based clinical reasoning when you need a traceable, guideline-referenced score output with a documented cutoff.
Side effects
- Missing required query parameters returns a validation error
- Age outside 1–120 integer range is rejected
- Invalid sex enum value (not 'male' or 'female') causes a bad request
- Boolean fields supplied as strings may cause parsing errors
- Score near the 7.5 threshold may be clinically ambiguous — not a diagnosis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/ripasa",
"count": 2,
"items": [
{
"age": 50,
"sex": "female",
"score": 1.5,
"formula": "ripasa",
"citation": {
"id": "chong-2010",
"pmid": "20428744",
"title": "Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis",
"source": "Singapore Med J. 2010;51(3):220-225",
"authors": "Chong CF, Adi MIW, Thien A, Suyoi A, Mackie AJ, Tin AS, Tripathi S, Jaman NH, Tan KK, Kok KY, Mathew VV, Paw O, Chua HB, Yapp SK"
},
"max_score": 16,
"components": [
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": "female",
"factor": "sex",
"points": 0.5,
"present": true
},
{
"factor": "rif_pain",
"points": 0,
"present": false
},
{
"factor": "migration_to_rif",
"points": 0,
"present": false
},
{
"factor": "nausea_vomiting",
"points": 0,
"present": false
},
{
"factor": "anorexia",
"points": 0,
"present": false
},
{
"value": false,
"factor": "symptoms_lt_48h",
"points": 0.5,
"present": true
},
{
"factor": "rif_tenderness",
"points": 0,
"present": false
},
{
"factor": "guarding",
"points": 0,
"present": false
},
{
"factor": "rebound_tenderness",
"points": 0,
"present": false
},
{
"factor": "rovsing_sign",
"points": 0,
"present": false
},
{
"factor": "fever",
"points": 0,
"present": false
},
{
"factor": "raised_wcc",
"points": 0,
"present": false
},
{
"factor": "negative_urinalysis",
"points": 0,
"present": false
},
{
"factor": "foreign_nric",
"points": 0,
"present": false
}
],
"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.",
"ripasa_band": "below_cutoff",
"formula_expression": "RIPASA = (age<40 → 1.0; age≥40 → 0.5) + (male 1.0; female 0.5) + 0.5*rif_pain + 0.5*migration_to_rif + nausea_vomiting + anorexia + (symptoms_lt_48h 1.0; else 0.5) + rif_tenderness + 2*guarding + rebound_tenderness + 2*rovsing_sign + fever + raised_wcc + negative_urinalysis + foreign_nric; Chong 2010; max 16; <7.5 below_cutoff, ≥7.5 at_or_above_cutoff"
},
{
"age": 50,
"sex": "female",
"score": 1.5,
"formula": "ripasa",
"citation": {
"id": "chong-2010",
"pmid": "20428744",
"title": "Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis",
"source": "Singapore Med J. 2010;51(3):220-225",
"authors": "Chong CF, Adi MIW, Thien A, Suyoi A, Mackie AJ, Tin AS, Tripathi S, Jaman NH, Tan KK, Kok KY, Mathew VV, Paw O, Chua HB, Yapp SK"
},
"max_score": 16,
"components": [
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": "female",
"factor": "sex",
"points": 0.5,
"present": true
},
{
"factor": "rif_pain",
"points": 0,
"present": false
},
{
"factor": "migration_to_rif",
"points": 0,
"present": false
},
{
"factor": "nausea_vomiting",
"points": 0,
"present": false
},
{
"factor": "anorexia",
"points": 0,
"present": false
},
{
"value": false,
"factor": "symptoms_lt_48h",
"points": 0.5,
"present": true
},
{
"factor": "rif_tenderness",
"points": 0,
"present": false
},
{
"factor": "guarding",
"points": 0,
"present": false
},
{
"factor": "rebound_tenderness",
"points": 0,
"present": false
},
{
"factor": "rovsing_sign",
"points": 0,
"present": false
},
{
"factor": "fever",
"points": 0,
"present": false
},
{
"factor": "raised_wcc",
"points": 0,
"present": false
},
{
"factor": "negative_urinalysis",
"points": 0,
"present": false
},
{
"factor": "foreign_nric",
"points": 0,
"present": false
}
],
"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.",
"ripasa_band": "below_cutoff",
"formula_expression": "RIPASA = (age<40 → 1.0; age≥40 → 0.5) + (male 1.0; female 0.5) + 0.5*rif_pain + 0.5*migration_to_rif + nausea_vomiting + anorexia + (symptoms_lt_48h 1.0; else 0.5) + rif_tenderness + 2*guarding + rebound_tenderness + 2*rovsing_sign + fever + raised_wcc + negative_urinalysis + foreign_nric; Chong 2010; max 16; <7.5 below_cutoff, ≥7.5 at_or_above_cutoff"
}
]
}
}Tags
x402
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