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Patch Test

What is a Patch Test?
The Patch Test is a reliable allergen patch skin test designed to help your doctor determine whether or not you are allergic to any substances included on the test panel.It is a unique, direct “in vivo” test independent of any laboratory procedure. High reliability is achieved through use of highly purified, standard test substances.Chemotechnique Diagnostics offers the widest range of commercially available allergens for patch testing covering more than 350 different allergens.

How long will I wear the test patch?
Your doctor will ask you to return after the panels have been on your back for a minimum of 48 hours.

Are there activities I should avoid while the test patch is on my back?
Just a few: When bathing or showering, you must be careful not to get the test panel or surrounding area wet. If the test panel does become wet, it may loosen, allowing the test substances or marking ink to be washed away.For the same reason, any activity that may cause you to sweat or cause the test panel to loosen, such as sun bathing or exercising, should also be avoided.If for any reason an area of the test panel does become loose, you should immediately reattach it with a hypoallergenic adhesive tape.

When will my results be read?
The date and time of your next visit will be given to you during your visit. It is very important that you keep this appointment. Since a reaction to any of the test substances will continue to develop even after the panels are removed, your doctor will determine how long you should wait before your next appointment.

What is the doctor looking for?
At each of your next appointments, your doctor will carefully examine the test area for signs of an allergic reaction. This reaction usually consists of rash with swelling, redness, and tiny blisters. Redness alone, however does not necessarily mean that you have had an allergic reaction.

What should I do if the test area itches or burns?
Itching and burning sensations are common with patch testing. If itching and burning sensations become severe, you should contact your doctor.Try not to scratch the test area. If you do, the skin may become irritated and itch even more. Skin that has become red and irritated by scratching will make it difficult by your physician to interpret the result of the test.

What is the next step if the test shows that I am allergic to one or more of the substances?
If you are allergic, your doctor will provide information on where in your everyday surroundings you are likely to come in contact with the substances to which you are allergic.Your doctor will also tell you how best to avoid these substances and possibly suggest alternatives to them.

What does a negative test result mean?
The PATCH TEST is designed to identify the most common allergens that cause allergic contact dermatitis. A negative test result will minimize the need to restrict your use of products that contains these allergens.Furthermore, a negative result provides valuable information that will help your doctor diagnose your condition and initiate treatment.


The “Love Your Skin” show, hosted by Advanced Dermatology’s outstanding dermatologists, discusses various aspects of medical conditions of the hair, nails, and skin, and also covers cosmetic, laser dermatology and plastic surgery techniques and how they can better your skin’s health and appearance.

Allergy Testing (Dr. Levine) Full Show

The following is a partial list of allergens tested by our LAB:

Benzocaine 5% petEthyleneurea, meIamine formaldehyde 5% pet
2-Mercaptobenzothiazole 1% pet2-tert-butvl-4-methoxyphenol 2% pet
Colophony 20% petGoldsodiumthiosulfate 0.5% pet
4-paraphenylenediamine 1% petEthyl acrylate 0.1% pet
Imidazolidinylurea 2% petGlyceryl thioglycolatete 1% pet
Cinnamic aldehyde 1% petTosylsulfonamideformaldehyde resin 10% pet
Amerchol L 101 50% petMethyl methacrylate 2% pet
Carba Mix 3% petCobalt chloride hexahydrate 1% pet
Neomycin sulfate 20% petTixocortal-21-pivolate 1% pet
Thiuram Mix 1% petBudesonide 0.1% pet
Disperse Red 171% petChloroxylenol 0.5% pet
Ethylenediamine dihydrocloride 1% petTriethanoamine 2% pet
Epoxy resin 1% petCetyl/stearyl alcohol 5% pet
Quarternium-15 2% petTea tree oil 5% pet
4-tert-butylphenoIformaIdehyde resin 1% petDisperse Blue 124 1% pet
Mercapto mix 1% petDisperse Yellow 1 % pet
N-isopropyl-N-phenyl-4-phenyl 0.1% petBenzyl salicylate 2% pet
Potassium dichromate 0.25% pet4-Aminoazobenzene .25% pet
Balsam of Peru 25%Isoeugenol 2% pet
Nickelsulfate hexahydrate 2.5% petEugenol 2% pet
2.5-Diazolidinylurea 1% petDMDM hydantoin 1% pet
Tocopherol petYlang vlang oil 2% pet
Bacitracin 20% petBenzyl alcohol 1% pet
DiphenyIthiourea 1% petIsopropyl myristate 20% pet
Disperse Orange 1% petTriclosan 2% pet
Parabens mix 12% petDiphenylguanidine 1% pet
Euxyl K400 2.5% petPolysorbate 5% pet
Fragrance mix 8% petsDibutylthiourea 1 %
Glutaraldehyde 0.5% petI 2-N-octyl-4-isothiazolin 0.1% pet
2-bromo-2-nitropropane 0.5% petI 2-N-octyl-4-isothiazolin 0.1% pet
Sesguiterpenelactone mix 0.1% petBenzalkonium chloride 0.1% aq
Thimerisal 0.1% petCocamidopropyl betaine 1% aq
Disperse Red 1% petFormaldehyde 1% aq
2hydroxy-4-methoxybenzophenone 3% petKathon CC 0.1% aq
2-chloro-3,5-xylenol 1% petProplyene glycol 30% aq



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Advanced Dermatology’s Medical Director, Joshua L. Fox, M.D. FAAD, speaks on common Skin Allergies and Patch Testing


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