Certified Nursing Assistant (CNA) Practice Exam 2026 - Free CNA Practice Questions and Study Guide

During a bed bath, the water in the bath basin should be changed whenever it becomes cool or too soapy. This ensures that the water remains at a comfortable temperature for the person receiving the bath and that it remains clean and sanitary. Changing the water after the bath is completed may result in the water being too cold or dirty, and changing it only once a day may not be enough to maintain proper hygiene. Therefore, option B is the most appropriate and safe choice for giving a bed bath.