An allergy label arrives as a word - penicillin, morphine, latex - and the word is where most assessments stop. Three questions turn it back into a history, and they take under a minute.
What happened? A rash is not anaphylaxis, and nausea, diarrhoea or a headache are not allergy at all. Ask the patient to describe the reaction rather than name it. When did it happen? A reaction in childhood, fifty years ago, recorded by a parent, carries almost no information about how the patient would respond today. And have you taken it, or anything like it, since? Patients frequently have - often without noticing that the drug they tolerated last year belongs to the class they are labelled against.
Write the answers in the record, not just the conclusion. A label that says 'penicillin - rash aged 6, has since tolerated co-amoxiclav' lets the next clinician make a decision; a label that says 'penicillin allergy' guarantees that every clinician after you reaches for the second-choice drug, which is where today's complication rate comes from.
- What happened - ask for the description, not the label
- When - a childhood reaction reported by a parent decades ago is weak evidence
- Have you had it since, including anything in the same class
- Record the answers in the allergy field itself, not in a buried clinic letter
- Refer for formal testing where the label constrains first-choice therapy and the history is unconvincing
Why it matters
The label, not the allergy, is what drives the second-choice prescribing that harms these patients.
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