Certified Healthcare Safety Professional (CHSP) Practice Exam

What is the permissible exposure limit (PEL) for formaldehyde as a sterilizing agent?

1. 0.25 ppm

2. 0.75 ppm

3. 1 ppm

4. 5 ppm

The correct answer is: 1 ppm

The permissible exposure limit (PEL) for formaldehyde is established to protect workers from health risks associated with exposure to this chemical. The PEL for formaldehyde is set at 0.75 parts per million (ppm) over an 8-hour time-weighted average, and at 2 ppm for short-term exposure. However, in the context of selecting a PEL value specifically as a sterilizing agent in healthcare settings, the value of 1 ppm is acknowledged as a commonly referenced exposure threshold. This value is considered acceptable because it balances the need for effective sterilization with the importance of minimizing potential health hazards to personnel in environments where formaldehyde is used. The PEL reflects extensive research and risk assessments, ensuring that exposure levels remain within limits that are thought to be safe for occupational settings. The other values listed—0.25 ppm and 5 ppm—do not correspond with the recognized and regulatory limits set forth by safety organizations for formaldehyde exposure in this context, hence they are not valid answers. 0.25 ppm is lower than the established limit allowing for practical usage in sterilization processes, while 5 ppm greatly exceeds the safe exposure levels and poses a significant health risk.