Skin preparation for RL and LL electrode placement should include what?

• A. The skin should be shaved and rubbed with an alcohol pad.
• B. The skin should be cleaned, dried, and placed on a fat area.
• C. The skin should be cleaned but not dried.
• D. No skin prep is necessary.

Answer: (B)

Preparing the skin before placing RL and LL electrodes helps reduce impedance and keeps the electrode firmly attached so measurements are reliable. Cleaning removes oils, sweat, and dirt that interfere with conduction. Drying ensures there’s no moisture that could change impedance or hinder adhesion. Placing the electrode on a fat area gives a broad, pliable surface that can maintain consistent contact, reducing movement and signal variability. Skipping prep, or only lightly cleaning, or placing on oily or uneven skin would lead to higher impedance and less stable readings.