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SULF-FAST Sulfa Allergy Risk Score Calculator
x402
SULF-FAST Sulfa Allergy Risk 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 2026-09-14).
Computes the Waldron 2023 SULF-FAST score to stratify risk in patients reporting a TMP-SMX (sulfa) antibiotic allergy, returning a numeric score and low/elevated risk classification.
Price / call$0.005
Success—
StatusUnknown
How this service works
Waldron 2023 SULF-FAST for patients who already report a TMP-SMX (sulfa antibiotic) allergy. Adapted PEN-FAST flags, not PEN-FAST itself. 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: low if score < 3, elevated if ≥ 3. low_risk_for_testing iff score < 3. Not an allergy diagnosis or delabeling order. magent does not take an allergy history.
Output
Returns a SULF-FAST integer score (0–5), a risk category (low if score < 3, elevated if score ≥ 3), and a low_risk_for_testing boolean. This is a clinical decision-support score only — not an allergy diagnosis or a delabeling order.
Example use cases
Pre-antibiotic allergy workup risk triage
“I have a patient with a documented TMP-SMX allergy — the reaction happened 2 years ago, they had angioedema, and they needed treatment. What's their SULF-FAST score and are they low risk for allergy testing?”
Low-risk sulfa allergy confirmation for prescribing
“My patient says they had a sulfa allergy reaction more than 5 years ago, no anaphylaxis or SCAR, and no treatment was needed. Can you run the Waldron 2023 SULF-FAST calculation so I can document their risk level?”
Elevated risk flag before formulary substitution
“Before I consider an alternative antibiotic, I need to know if this patient's sulfa allergy is elevated risk — the event was 4 years ago, they didn't have anaphylaxis or SCAR, but they did require treatment. Please calculate the SULF-FAST score.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/sulf_fastWhen to prefer
Use this endpoint when you have a patient with a documented or reported TMP-SMX (sulfa antibiotic) allergy and need a structured, validated risk score based on the Waldron 2023 SULF-FAST criteria. Prefer this over general allergy tools when you specifically need sulfa-adapted PEN-FAST-style scoring. Do not use if the allergy involves penicillin or another drug class — use the appropriate PEN-FAST or drug-specific endpoint instead.
Side effects
- Missing required query parameters (five_or_fewer_years_ago, anaphylaxis_angioedema_or_scar, treatment_required) returns a 400 validation error
- Non-boolean values for flag parameters cause schema validation failure
- Payment not included or insufficient (x402 protocol) returns 402 Payment Required
- Attempting to use this for penicillin allergy or non-sulfa allergy contexts produces a misapplied score — caller must ensure the patient has a reported TMP-SMX allergy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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