Allergen patch tests or epicutaneous tests

    This test is performed to diagnose allergic contact dermatitis. Patch tests are performed when there is a suspicion that a person’s skin condition is related to chemical substances in their surrounding environment.

    Preparing for the test:

    • Two to four weeks should have elapsed since the exacerbation of the dermatitis in the testing area. 
    • Test patches are not placed on sunburned and heavily tanned skin.
    • Treatment with systemic prednisolone should be stopped one month before and treatment with topical glucocorticosteroids or hormone ointments a few days before the test.
    • On the morning of the test day, it is recommended to take a shower and not use skin care products on the back.
    • If there is a lot of hair on the back, the upper back should be shaved at least two days before the test.

    Testing lasts a total of five days, during which time you will have three dermatology nurse’s appointments.

    • Patches with 30 unique test substances will be applied to you on Monday. The test patches are left on the skin for 48 hours.
    • The test patches will be removed on Wednesday, when the initial assessment will take place.
    • The final evaluation of the test results will take place on Friday.

    During the testing period of five days:

    • Do not wash the area being tested
    • Active physical activity that causes sweating or the removal of patches from the skin in the test area should be avoided (swimming, running, strenuous physical activity, exercise, sauna, etc.)
    • Moderate itching of the skin may be felt in the test area, but the area should not be scratched
    • For some test substances, the colour of the substance may be transferred from the patches to clothing; during the test period, please wear darker clothes on the upper body

    Possible side effects

    • Skin irritation Hypersensitivity to the patch or chamber material
    • During testing, the existing rash may flare up. Irritated skin or ‘angry back syndrome’. A strong positive result makes the skin highly reactive so that a positive reaction also occurs in the area of other allergens
    • Skin pigmentation or depigmentation

    Broneeri aeg

    We provide this service

    Raatuse Health Centre
    Raatuse 21, Tartu