Do you experience itchy rashes, skin inflammation, or suspect you’re allergic to certain substances? A skin allergy test (Patch Test) is an accurate way to find the root cause of your skin problem.
Bangkok Hospital Phuket offers skin allergy testing using the internationally recognized standard set (IS-1000 Series), certified and highly safe. Our expert dermatologists provide consultation and personalized treatment plans.
What is Patch Test?
A Patch Test involves applying test patches containing common allergens to your skin to observe any reactions. It helps identify specific substances you’re allergic to, enabling avoidance and allergy prevention.
Who Should Consider a Patch Test?
- Individuals with chronic itchy rashes or skin inflammation.
- Those suspecting allergies to cosmetics, skincare products, or chemicals.
- Individuals with a family history of allergies.
- Anyone seeking to pinpoint the exact allergens for targeted prevention and treatment.
Patch Test Series at Bangkok Hospital Phuket:
We use the IS-1000 Series, which includes the following common allergens:
- p-PHENYLENEDIAMINE (PPD)
- 4-tert-Butylphenolformaldehyde resin (PTBP)
- Budesonide
- Carba mix
- METHYLISOTHIAZOLINONE+METHYLCHLOROISOTHIAZOLINONE
- Cobalt (II)chloride hexahydrate
- COLOPHONIUM
- Compositae mix II
- DIAZOLIDINYL UREA
- Epoxy resin, Bisphenol A
- FORMALDEHYDE
- Fragrance mix I
- Fragrance mix II
- IMIDAZOLIDINYL UREA
- LANOLIN ALCOHOL
- Mercapto Mix
- METHYLDIBROMO GLUTARONITRILE
- Peru balsam
- N-Isopropyl-N-phenyl-4-phenylenediamine (IPPD)
- Neomycin sulfate
- Nickel (II) sulfate hexahydrate
- Paraben mix
Preparation Before the Patch Test:
- Bring Suspected Items: Bring in all items that you suspect are the cause of your allergy, including the packaging that shows each item’s detail, for testing.
- Avoid Topical Medications: Refrain from applying any topical medications to the test area (usually the back) at least 1 week prior, especially corticosteroids.
- Avoid Sun Exposure: Avoid sunbathing or direct sun exposure to the test area for at least 2 weeks before the test.
- Inform About Medications: Inform your doctor about all medications you are taking. Certain medications, including antihistamines (both prescription and over-the-counter), tricyclic antidepressants, H2 blockers (like famotidine or ranitidine), and corticosteroids like prednisolone, can interfere with allergy test results.
- Wear Comfortable Clothing: Wear comfortable and loose-fitting clothing to avoid friction on the test area.
- Avoid Strenuous Exercise: Avoid strenuous exercise that causes excessive sweating on the test day.
- Pregnancy: Inform your doctor if you are pregnant or planning to become pregnant.
Testing Process:
- Consultation: See a doctor to assess your symptoms and plan the test.
- Application: Test patches are applied to the skin (usually on the back) and left for 48 hours.
- Reading: Return to the doctor for test results on Day 2 and 3/4 after application. In some cases, an additional reading may be scheduled on Day 7 (Delay Reading).
- Treatment Planning: Get personalized advice from your doctor to avoid allergens and treat symptoms.
Reference: IS-1000 International Standard Series, Chemotechnique Diagnostics AB. chemotechnique.se
