PEN-FAST Penicillin Allergy Risk Score
PEN - Penicillin allergy reported by patient
F - Five years or less since reaction - 2 points
A - Anaphylaxis or angioedema OR
S - Severe cutaneous adverse reaction  - 2 points
T - Treatment required for reaction - 1 points
Interpretation:
0 Very low risk of positive penicillin allergy test <1% (<1 in 100 patients reporting penicillin allergy)
1-2 Low risk of positive penicillin allergy test 5% (1 in 20 patients)
3 Moderate risk of positive penicillin allergy test 20% (1 in 5 patients)
4-5 High risk of positive penicillin allergy test 50% (1 in 2 patients)

(PMID: 32176248)

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