Which of the following is a safety precaution of ultrasound?

• A. Acute inflammation
• B. Normal activity
• C. Adequate hydration
• D. Healthy sleep

Answer: (A)

Safety precautions for ultrasound focus on avoiding energy delivery when it could worsen the tissue state. Acute inflammation is a situation where applying ultrasound, especially with heating, can increase edema, pain, and metabolic demand, potentially prolonging healing or aggravating the condition. Because of this risk, ultrasound is avoided or used with strict caution in areas with acute inflammation. The other options—normal activity, adequate hydration, and healthy sleep—are general health factors that support recovery but do not describe a specific ultrasound safety precaution.