CDT Allergy Testing & Patch Testing

Question 1

What is the primary purpose of patch testing in dermatology?

Accepted Answer

To identify contact allergens causing allergic contact dermatitis

Answer

Patch testing is the gold standard procedure for identifying specific contact allergens responsible for allergic contact dermatitis.

Question 2

Where are patch test panels typically applied on the body?

Accepted Answer

Upper back

Answer

Patch tests are applied to the upper back because it provides a large, flat surface area with relatively uniform skin for multiple allergen applications.

Question 3

How long should standard patch tests remain in place before removal and the first reading?

Accepted Answer

48 hours

Answer

Standard patch tests are left in place for 48 hours before removal and initial reading per international patch testing guidelines.

Question 4

Which of the following is a contraindication for patch testing?

Accepted Answer

Active widespread dermatitis on the upper back

Answer

Active widespread dermatitis on the upper back prevents proper placement of test chambers and accurate interpretation of results.

Question 5

Which standardized patch test system is most commonly used and FDA-approved in the United States?

Accepted Answer

TRUE Test (Thin-layer Rapid Use Epicutaneous Test)

Answer

The TRUE Test is the FDA-approved, ready-to-use standardized patch test system most widely used in US dermatology practices.

(CDT) Certified Dermatology Tech Practice Test

(CDT) Certified Dermatology Tech Practice Test

CDT Allergy Testing & Patch Testing