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pARC Pediatric Appendicitis Risk Calculator (Kharbanda 2018)
x402
pARC Pediatric Appendicitis Risk Calculator (Kharbanda 2018) 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 pediatric Appendicitis Risk Calculator (pARC) logistic probability score from clinical variables per Kharbanda 2018 Table 3, returning the logit and estimated probability percent.
Price / call$0.005
Success—
StatusUnknown
How this service works
Kharbanda 2018 Table 3 pediatric appendicitis risk calculator (pARC): logistic probability from sex, age (5-18 years), pain duration, pain with walking, migration of pain to RLQ, maximal RLQ tenderness, abdominal guarding, and ANC (x10^3/uL; 1.77*sqrt(ANC) if <14, else constant 6.62). Returns logit and estimated_probability_percent. Not a medical device, not a diagnosis, not PAS, and not Alvarado. magent does not examine the child.
Output
Returns a JSON object with two fields: 'logit' (the raw log-odds output of the Kharbanda 2018 Table 3 logistic model) and 'estimated_probability_percent' (the converted probability of appendicitis as a percentage, 0–100). The ANC contribution uses 1.77*sqrt(ANC) if ANC < 14, or a constant 6.62 if ANC >= 14, per the published model. Not a diagnosis, not a medical device, and not equivalent to PAS or Alvarado scoring.
Example use cases
ED triage appendicitis risk scoring
“I have a 9-year-old female in the ED with suspected appendicitis — pain started 30 hours ago, she has pain with walking, migration to the RLQ, maximal tenderness in the RLQ, no abdominal guarding, and her ANC is 8.2 x10^3/uL. What does the pARC calculator give for her appendicitis probability?”
Comparing risk before imaging decision
“Before we decide on CT for this 14-year-old male with abdominal pain, can you run the Kharbanda pARC score? Pain duration is 24 to 48 hours, he has pain with walking, no migration to RLQ, maximal RLQ tenderness present, guarding present, and ANC is 16.0 x10^3/uL.”
Low-risk pediatric appendicitis workup
“Can you calculate the pARC appendicitis probability for a 7-year-old female with pain under 24 hours, no pain with walking, no pain migration to RLQ, no maximal RLQ tenderness, no guarding, and ANC of 4.5 x10^3/uL — I want to see if she's low enough risk to observe.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/parcWhen to prefer
Use this endpoint when you need the specific Kharbanda 2018 Table 3 pARC logistic model — not the Pediatric Appendicitis Score (PAS) or Alvarado score. Prefer pARC when your clinical inputs include an ANC value and you are working within the 5–18 year age range. This endpoint is best suited for structured clinical decision support workflows where discrete, well-defined inputs are available and you want a validated logistic probability output rather than a categorical risk tier.
Side effects
- Age outside 5–18 years range causes validation error
- ANC outside 0–80 x10^3/uL range rejected
- Pain duration value not matching enum (lt_24, 24_lt_48, 48_96) causes schema error
- Missing any required query parameter returns 400/422 error
- Pain duration beyond 96 hours not supported by derivation cohort
- Payment of 0.005 USDC not provided results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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