What position is a person in when lying on their stomach?

The correct answer is the term "prone," which specifically describes the position of an individual lying flat on their stomach with their face down. This position is commonly used in various medical and diagnostic settings, including certain types of examinations and imaging studies.

In contrast, the supine position refers to lying on the back, with the face upward. The terms right and left decubitus describe positions where an individual is lying on their side, specifically either on the right or left side, with potential variations based on the orientation of the body. Understanding these terms is essential for accurately describing patient positioning in a medical or sonographic setting, as it can impact the findings of examinations and the approach taken by healthcare professionals.