Diagnosis of Allergy


To determine if a patient is allergic , and see what substance or allergen is causing the allergic reaction, the specialist shall conduct a study of the patient through a series of skin tests ” in vivo ” (prick -test, provocations and intradermal ) and ” in vitro ” ( consisting lab detect patient serum IgE levels ) .

This Angouleme Laboratory Specialist provides all necessary tests to diagnose correctly if you have allergies.

Prick -test

Consists of the administration of the suspected allergen or substance causing the allergic reaction by a drip on the patient’s forearm , followed by puncturing the skin with a lancet and removal of excess liquid.

Subsequently, the patient will have to wait about fifteen minutes, after which the doctor will interpret the results based on the type of reaction that has occurred in the patient’s skin .

If the patient is allergic wheal with swelling and redness at the site of the puncture, due to the release of histamine from mast cells develop , this means that the allergen may be responsible for much of your allergy symptoms.

Positive and negative ; , to verify that the test was successful , two controls are used if the test was properly performed a papule will take place in the area where you have placed the positive control (histamine ) and absence of any reaction to the negative control (saline) .

Angouleme Laboratory Specialist offers a wide range of allergens for the correct diagnosis of allergy.


When skin prick tests give a negative result and the specialist suspected allergen in question is causing the allergic reaction , often proceed to use other diagnostic method , intradermal tests or intradermal (IDR ) to investigate the suspicious substance or allergen causing the allergic reaction.


Provocation tests consist of administration of the suspected allergen to an allergic reaction , directly through the conjunctiva and the respiratory tract ( lung or nose ) in order to reproduce the symptoms that occur during an allergic process .

There are three types of provocation tests :

Conjunctival Provocation : Applying suspicious substance in the conjunctiva of the eye. This test is usually done before a conjunctival pathology.

Nasal Provocation : Should rhinitis, proceed to spray the allergen in question in the nose.

Bronchial Provocation : Inhalation of allergen to pathologies with asthma or respiratory allergies.