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PEN-FAST Penicillin Allergy Risk Calculator
x402
PEN-FAST Penicillin Allergy Risk 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).
Computes the Trubiano 2020 PEN-FAST score (0–5) and risk category for patients with a reported penicillin allergy to guide allergy testing decisions.
Price / call$0.005
Success—
StatusUnknown
How this service works
Trubiano 2020 PEN-FAST for patients who already report a penicillin allergy. Three caller-assigned flags: allergy event 5 or fewer years ago (2), anaphylaxis/angioedema or potential SCAR as one criterion (2), treatment required (1). Max 5. Risk: 0 very_low, 1–2 low, 3 moderate, 4–5 high. low_risk_for_testing iff score < 3. Not an allergy diagnosis or delabeling order. magent does not take an allergy history.
Output
Returns the total PEN-FAST score (integer 0–5), a risk category (very_low, low, moderate, or high), and a boolean low_risk_for_testing flag (true if score < 3), indicating whether the patient is a candidate for low-risk penicillin allergy evaluation per the Trubiano 2020 tool.
Example use cases
Pre-antibiotic allergy triage in hospital
“I have a hospitalized patient with a documented penicillin allergy — the event was 2 years ago, it was angioedema, and treatment was required. What's their PEN-FAST score and are they low risk for testing?”
Outpatient allergy delabeling screening
“I'm seeing a patient in clinic who says they had a penicillin allergy reaction over 10 years ago with no anaphylaxis or angioedema and no treatment was needed. Run the PEN-FAST calculator for me.”
Antimicrobial stewardship risk check
“For antimicrobial stewardship review: the allergy event happened more than 5 years ago, it was not anaphylaxis, angioedema, or a SCAR reaction, and no treatment was required. What's the PEN-FAST risk category?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/pen_fastWhen to prefer
Use this endpoint when you need a fast, validated, structured PEN-FAST risk score for a patient with a reported penicillin allergy and you already have the three binary clinical flags (timing, phenotype severity, treatment required). It is purpose-built for the Trubiano 2020 instrument and returns a machine-readable risk category and testing recommendation flag, making it ideal for clinical decision support workflows, antimicrobial stewardship automation, or pre-prescription allergy screening pipelines.
Side effects
- Missing required query parameters (five_or_fewer_years_ago, anaphylaxis_angioedema_or_scar, treatment_required) returns a 400 error
- Non-boolean values for boolean parameters cause validation errors
- Payment header missing or insufficient USDC balance returns 402 Payment Required
- Caller misclassifies allergy phenotype leading to incorrect score — the API trusts caller-assigned flags and does not validate clinical accuracy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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