Which skin preparation is recommended before applying electrodes?

• A. Wipe with alcohol but do not dry
• B. Moisturize with oil
• C. Apply lotion
• D. Clean the skin well with soap and water and dry thoroughly

Answer: (D)

Skin preparation matters because reliable electrode readings depend on clean, low-impedance contact between the skin and the electrode. Oils, lotions, or moisture on the skin create a barrier that increases impedance and can cause poor signal quality or electrode detachment. Washing the area with soap and water removes sweat, oils, and dirt, and drying thoroughly ensures there’s no moisture that could interfere with adhesion. Alcohol can clean briefly but may dry the skin or leave a film, which isn’t ideal for best contact. So the best approach is to clean the skin well with soap and water and dry thoroughly before applying electrodes.