Allergic reactions occur only after repeated exposure to a specific biological allergen.

The health care provider will wait to test for the specific allergen that caused anaphylaxis (if the cause is not obvious) until after treatment.

The different kinds usually have in common an allergic reaction to specific allergens.

More than 400 specific allergens can be tested for in this way.

People inherit a tendency to be allergic, although not to any specific allergen.

Have had a positive skin or blood test for a specific allergen.

Often, the specific allergen cannot be identified unless you have had a similar reaction in the past.

Allergy testing is done to see identify the specific allergens that are causing your symptoms.

As an alternative, some doctors now use a blood test to detect antibodies to specific allergens.

Allergy testing may reveal the specific allergens to which an individual is sensitive.