Which step is unnecessary during a surgical hand scrub?

The step of dispensing an antimicrobial scrub agent on dry arms is unnecessary during a surgical hand scrub. The correct procedure involves wetting the hands and arms first to enhance the effectiveness of the antimicrobial scrub agent. When the scrub agent is applied to wet skin, it helps to activate the antimicrobial properties better, allowing for a more thorough disinfection. Applying it directly to dry arms does not optimize its effectiveness and can lead to inadequate microbial reduction.

The other steps mentioned are essential components of the surgical hand scrub. Washing all four sides of each finger ensures comprehensive cleaning, as fingers have nooks and crannies where microorganisms can reside. Cleaning the sublingual areas with a nail cleaner helps remove debris and bacteria from under the nails, which is crucial since infectious agents can hide in these areas. Finally, using a brush to scrub under the nails is also critical for removing dirt and microorganisms, contributing to the overall efficacy of hand hygiene before a surgical procedure.