Florida Cosmetology Licensing ExamHair ServicesEasy
A client is scheduled for a hair coloring appointment. The cosmetologist is performing a predisposition test (patch test). Where on the client's body is the test typically applied to check for potential allergic reactions?
- ABehind the ear or on the inner elbow
- BOn the scalp near the hairline
- COn the inside of the wrist
- DOn the nape of the neck
Show answer & explanationAnswer & explanation
Correct answer: A. Behind the ear or on the inner elbow
A predisposition test, also known as a patch test, is performed to check for allergic reactions to hair color products. It is typically applied to a sensitive, inconspicuous area of the skin, such as behind the ear or on the inner elbow, 24 to 48 hours before the service.
Why the other options are wrong
- B. Applying directly to the scalp or near the hairline is too close to the intended service area and could cause visible irritation if a reaction occurs, defeating the purpose of an inconspicuous test.
- C. The inside of the wrist is a sensitive area but not the primary recommended site; behind the ear or inner elbow are preferred due to less exposure and similar skin sensitivity to the scalp.
- D. The nape of the neck is often used for strand tests, but for a patch test, behind the ear or inner elbow are more common and less likely to be disturbed.
Predisposition Test (Patch Test)
A test required by federal food, drug, and cosmetic acts to identify a possible allergy to hair color products before full application.
- Must be performed 24-48 hours prior to the service.
- Applied to a small, inconspicuous area of skin, typically behind the ear or on the inner elbow.
- Positive reaction indicates an allergy, and the service should not proceed.
Memory trick: PATCH test for ALLERGIES, behind the EAR or inner ELBOW, for safety.