Chemical Allergy

What is Patch Testing?

Patch testing is a way of identifying whether a substance that comes in contact with the skin is causing inflammation of the skin (contact dermatitis).

There are two types of contact dermatitis: irritant contact dermatitis and allergic contact dermatitis.

Patch testing can help to differentiate between the two. The test involves the application of various test substances to the skin under adhesive tape that are then left in place for 48 hours.

The skin is then examined a further 48 hours later for any response. This can help the doctor decide which allergens you are allergic to and identify those that could be aggravating your dermatitis. The doctor will then be able to advise how you can avoid the allergens.

Patch Testing T.R.U.E. TEST is a reliable, easy to use patch test.

It is designed to help your doctor find out whether you are allergic to the substances
included on the test panels (shown in the table below). The test panels contain 35 different substances known to cause allergic contact dermatitis.

Panel 1


1. Nickel sulphate

7. Colophony

2. Wool alcohols

8. Paraben mix

3. Neomycin sulfate

9. Negative control

4. Potassium dichromate

10. Balsam of Peru

5. Caine mix

11. Ethylenediamine dihydrochloride

6. Fragrance mix

12. Cobalt dichloride

Panel 2


13. p-tert-Butylphenol formaldehyde resin

19. Methyldibromo Glutaronitrile

14. Epoxy resin

20. p-Phenylenediamine

15. Carba mix

21. Formaldehyde

16. Black rubber mix

22. Mercapto mix

17. Cl+Me- Isothiazolinone

23. Thimerosal

18. Quaternium-16

24. Thiuram mix

Panel 3


25. Diazolidinyl Urea

31. Hydrocortisone-17-Butyrate

26. Quinoline Mix

32. Mercaptobenzothiazole

27. Tixocortol-21-Pivalate

33. Bacitracin

28. Gold Sodium Thiosulfate

34. Parthenolide

29. Imidazolidinyl Urea

35. Disperse Blue 106

30. Budesonide

36. 2-Bromo-2-nitropropane-1,3-diol

Testingfor allergies

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