Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam

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Which concentration is most effective in alcohol hand sanitizers?

20% to 40%
40% to 60%
60% to 95%
95% to 100%

The correct answer is: 60% to 95%

The concentration of alcohol that is most effective in hand sanitizers ranges from 60% to 95%. This effectiveness is due to the ability of alcohol to denature proteins and disrupt cell membranes, which is crucial for killing pathogens. Studies indicate that hand sanitizers containing at least 60% alcohol are effective against a variety of germs, including bacteria and viruses. Lower concentrations, such as those below 60%, may not sufficiently kill pathogens, while concentrations that are too high (above 95%) can evaporate too quickly and may not allow enough contact time for effective microbial kill. Therefore, for optimal efficacy in sanitizing hands, a concentration of alcohol within the range of 60% to 95% strikes the right balance for effective disinfection while maintaining sufficient contact time on the skin.