Summarize possible reasons behind a negative Phadiatop despite a positive single allergen?
1) Phadiatop has a sensitivity of >90 %, which is very good, but somewhat lower sometimes than a single allergen.
2) The patient may be monosensitized to food or other allergens not covered by Phadiatop.
3) Due to non-atopic allergy with sensitization only to allergens such as venoms, drugs or occupational allergens.
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