Wound Care Certification Practice Exam 2025 – Complete Prep Guide

An active support surface is designed to actively change pressure points to improve blood flow and reduce the risk of pressure injuries. Alternating pressure mattresses fit this definition because they have mechanisms that promote circulation by alternating the pressure under the patient. This function helps distribute weight more evenly and provides relief from prolonged pressure on any one area of the body.

In contrast, foam mattresses, static air mattresses, and gel mattresses do not have the capability to change their pressure dynamics actively. Foam mattresses offer consistent support but do not adjust themselves based on the patient's position. Static air mattresses also provide a constant pressure, while gel mattresses typically conform to the body but do not have an active adjustment mechanism. Therefore, the property that sets the alternating pressure mattress apart as an active support surface lies in its ability to dynamically alter pressure, which significantly aids in preventing pressure ulcers and promoting healing.