Scientific Concepts and Infection Control
Domain 1, Scientific Concepts and Infection Control, tests the biology, chemistry, and microbiology that sit behind every service, plus the sanitation rules that protect clients and licensees. Expect questions on cleaning versus disinfection, implement handling, contagious conditions, and safe work practices under New Mexico Board rules.
Core rules
- Cleaning removes visible debris with soap and water; it does not kill pathogens.
- Disinfection uses an EPA-registered hospital-grade disinfectant, mixed and timed according to its label, on nonporous implements after cleaning.
- Sterilization destroys spores and is required only for items that penetrate skin or contact blood; it is not the routine step for combs and shears.
- Porous items such as neck strips, cotton, and wooden sticks are single-use and must be discarded.
- Wash hands before and after every client; wear gloves for blood exposure and for services that may break skin.
Worked example
A client arrives with a circular, scaly, inflamed patch on the scalp. The correct action is to not perform the service, refer the client to a physician, and disinfect any tool that contacted the area. Reasoning: the patch suggests a contagious fungal infection such as tinea capitis. Serving the client risks spread to other clients and staff, and New Mexico rules require licensees to refuse service for suspected contagious conditions.
Traps that cost marks
- Saying a UV cabinet or “sanitizer” replaces disinfection; neither is a substitute for an EPA-registered disinfectant.
- Disinfecting a comb while it still has hair and debris on it; cleaning must come first.
- Claiming all implements must be sterilized after each client; that is not the standard for nonporous tools that do not break skin.
- Forgetting to disinfect electrical tools and clipper blades according to the manufacturer’s directions.