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Patch Testing - an Emerging Need to Prevent Allergic Reaction

Written by
Dr. Suvash Sahu
and medically reviewed by iCliniq medical review team.

Published on Nov 23, 2016 and last reviewed on Dec 30, 2019   -  2 min read


Are you suffering from some type of allergy? If yes, then a patch test can help you. It is a safe and painless test done to diagnose allergic skin conditions. Read the article to know more.

Patch Testing - an Emerging Need to Prevent Allergic Reaction

Patch test is a very important, safe and painless investigative tool to confirm allergic contact dermatitis. However, the use of several ingredients in cosmetics and the absence of labelling the ingredients in most of the cosmetics, limit the use of patch test. It also helps in the diagnosis of photoallergic dermatitis. The use of patch testing has also extended into research for investigating the irritant potential of various topical cosmetics like Balsam of Peru, formaldehyde, fragrance, PPD (para phenylenediamine), etc.

Principle of Patch Testing

It is usually used for demonstration of hypersensitivity reaction (delayed type) in case of suspected allergic contact dermatitis. In this procedure, allergen is applied in a patch to the upper back or outer arm or outer thighs in the same order of preference. The patch is removed from the site of application after 48 hours and then read for any reaction.


Types of Patch Testing

1) Closed or Standard Patch Testing:

In this, offending cosmetics should be taken in appropriate amounts. It should be applied onto the common area of the skin, usually upper back and allowed to dry to facilitate evaporation of volatile contents and then occluded for 48 hours. The reading is taken after 72 hours. Positive results present as redness, swelling and multiple solid small tiny raised lesions to fluid filled eruptions at the site of contact.

2) Indian Standard Series:

Indian standard series contains mainly plant, cosmetics and footwear series allergens.

3) TRUE Test:

TRUE stands for thin-layer rapid use epicutaneous test. The advantage of this kit is, allergen is available in ready to use form.

4) Chemotechnique Diagnostics Patch Test:

Chemotechnique diagnostics patch test kit has tape mounted polyethylene plastic chambers with more than 25 different series including international standard series.

Complications of Patch Testing

To gather further information on patch testing, consult an allergy specialist online -->

Last reviewed at:
30 Dec 2019  -  2 min read




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