Special Warning : אזהרת שימוש

4.4   Special warnings and precautions for use

Sensitisation to a substance on the test panel only seldom occurs. A test reaction that appears on day 10 or later may be a sign of contact sensitisation.

Excited skin syndrome (angry back) is a state of hyperreactivity induced by dermatitis on other parts of the body or by a strong positive skin test reaction. Therefore, test results should be evaluated carefully in patients with multiple, positive, concomitant patch test results. To determine which reactions are false positive, retesting at a later date may be necessary.

The use of TRUE Test 24 in patients with a known history of anaphylactoid reactions should be carefully evaluated before application.



Excessive sweating and sun exposure of the test site is to be avoided. Sun tan may decrease patch test reactivity and cause false negative tests.

Avoid applying the test on skin with acne, scars, dermatitis or any other condition that may interfere with test results.

If a severe patch test reaction develops, the patient may be treated with a topical corticosteroid. In rare case treatment with systemic corticosteroid may be necessary.

Butylated hydroxyanisole (BHA) (E320) and Butylated hydroxytoluene (BHT) (E312) are present as antioxidants in allergen patch no. 7 Colophony (panel 1). BHA and BHT may cause local skin reactions (e.g. contact dermatitis), so a false positive reaction for Colophony may occur.

Effects on Driving

4.7   Effects on ability to drive and use machines
Not relevant.