Do I need to apply coupling agent for physical examination and color ultrasound

Physical examination and color ultrasound usually require the application of a coupling agent. Couplant is a water-based gel, which is mainly used to eliminate the air gap between the probe and the skin to ensure clear ultrasonic transmission. During the ultrasound examination, the doctor will apply a coupling agent to the surface of the skin at the examination site. The ingredients of the coupling agent are safe and non irritating, and will not cause harm to the skin. After inspection, they can be easily wiped off with a tissue. Its core function is to reduce sound wave reflection loss and make the image clearer by filling the tiny bumps and gaps in the skin and hair. Coupling agents can also reduce discomfort caused by probe friction and improve inspection comfort. In most cases, the coupling agent needs to cover the entire examination area, such as the abdomen, thyroid, or breast, and the dosage should be adjusted according to the examination range. In rare cases, if the subject is allergic to the coupling agent components, they may experience skin redness or itching. At this point, it is necessary to immediately inform the doctor to switch to alternative media or terminate the examination. People with allergies can proactively explain their condition before the examination, and doctors will choose low sensitivity coupling agents or take isolation measures. After the SEP examination, residual coupling agent can be washed with warm water to avoid forcefully wiping the skin. There is no need for special preparation before daily physical examination. Simply wear loose clothing for easy examination. If repeated ultrasound examination is required, the coupling agent needs to be reapplied to ensure imaging quality.