Past history and exposure patterns Past history and exposure patterns Past history and exposure patterns Past history and exposure patterns
Onset time Symptom Characteristics Consistency (+) or past history (-) Consistency (+) or past history (-) Consistency (+) or past history (-) Consistency (-)
Isolated Isolated Mixed
Direct Indirect
Classification Classification Classification Classification
≤2 hours* Anaphylaxis 1 2† 2 2
Urticaria (hives) 1 2 2 2
Itchy 2 2 2 3
Vomit 2 2 2 3
Diarrhea 2 2 2 3
>2 hours Negative 3 3 3 3