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 These methods benefit from a real obstruction since about fifteen years. Their innocuite, the speed of the answers that they bring, the possibility to multiply them, make a precious auxiliary of the diagnosis allergologique of it.
To what do they serve? do The tests have for interest to simulate visible way, on skin, the conflict generated by the allergic sensitization inside the organism.
The tests come following the clinical investigation led by the practitioner. So sometimes the diagnostic orientation is evoked by the simple clinic:Â typical hay fever, asthma to the hairs of animals or to the acariens, food or medicinal hives, in many cases several factors himself intriquent and complicate the gait. More and more often, the physicians are before this type of situation and must refine their diagnosis. Technique of the tests The tests the most fluently practiced to the practitioner's cabinet are the stamps (patch-tests) and the epidermal tests (prick-tests). The stamps They are used for the research of the contact allergies as well as the one of some food allergies. They consist in the application of a set of stamps smeared of the substance that one suspects to be responsible for the allergy to different concentrations, or of tested at the same time several substances. These stamps are glued on the patient's skin and are let some hours or some days in place. The goal is to get the patient's local effect similar to the dominant symptom. A very big number of professional eczemas finds their explanation thus. Bichromate of potassium of the cements (masons), solvents and chemical stains (various industries), materials as various as of the shampoings or lacquers (hairdressers) paintings (bodyworks), etc. The allergy to the latex, rare but very handicapping, is put thus easily in evidence. The child can benefit from this technique since the youngest age, for eczemas of contact,:Â produced of toilet, laundries and softeners, soaps but also in case of food origin eczema. A certain number of aggressive agents is unmasked thus:Â milk, certainly, but also the egg white, some vegetables, of the food stains. The increasing complexity of some food as the miscellanies of exotic fruits, the introduction of stains, fixers, gellants and other returns often delicate this type of diagnosis. Can one think that the introduction in the organism of proteins genetically modified will contribute to thicken even some mysteries?
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