Which action is appropriate to perform before applying a TENS unit?

• A. Ensure there is a healthcare provider's prescription for the TENS.
• B. Place the electrodes on the scalp.
• C. Instruct the client to adjust the intensity of stimulation.
• D. Remove hair or lotions from skin at the electrode sites.

Answer: (A)

Before applying a TENS unit, the key step is to confirm there is a clinician-prescribed order. A prescription ensures the therapy is appropriate for the patient, the correct treatment area is chosen, and the device settings (intensity, duration, frequency) are tailored and supervised. It also screens for contraindications and interactions with implants or other devices, reducing safety risks.

The other actions don’t fit as the primary pre-application step. TENS electrodes are placed on the skin over the painful area, not on the scalp. Allowing the patient to adjust the intensity before the device is activated can lead to unsafe stimulation levels. While removing hair or lotions at electrode sites helps ensure good contact, the crucial safety and appropriateness check is confirming the prescription first.