Which of the following methods of sterilizing unpackaged instruments is recommended for use in an electrologist's office?

Using an autoclave at 250 degrees Fahrenheit with 15-17 PSI for 15 minutes is the recommended method for sterilizing unpackaged instruments in an electrologist's office due to its effectiveness in achieving complete sterilization. Autoclaves utilize steam under pressure, which allows for a higher temperature to be reached than boiling water can achieve, ensuring that all types of microorganisms, including bacterial spores, are destroyed. This method is widely accepted in medical and cosmetic practices because it guarantees a high level of sterilization critical for the safety and health of clients.

Other methods of sterilization listed may not reach the same level of effectiveness as the autoclave. For example, chemical sterilization at room temperature may not be sufficient in killing all microbial life, especially spores, which could pose a risk in a setting where skin is being treated. Ultraviolet light exposure can be effective for surface disinfection but does not penetrate materials effectively to ensure full sterilization of instruments. Finally, boiling water for 10 minutes is not reliable for complete sterilization, as many pathogens, particularly thermophilic spores, can survive this treatment. Therefore, the autoclave method stands out as the most reliable and effective choice for maintaining hygiene in an electrology practice.