Summarize possible reasons behind a negative Phadiatop despite a positive single allergen?

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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As in all diagnostic testing, the diagnosis is made by the physican based on both test results and the patient history.