In which position should a patient lie for an examination of the abdomen and pelvis?

When examining the abdomen and pelvis, the dorsal recumbent position is typically the most appropriate choice. In this position, the patient lies on their back with their knees bent and feet flat on the examination table. This position provides easy access to the abdominal area for the examiner while also ensuring that the patient's abdomen is relaxed and can be palpated effectively.

Lying flat on the back allows for a thorough assessment of the abdomen, including visual inspection and palpation of the organs and structures within the abdominal cavity. Additionally, the bent knees in the dorsal recumbent position can help alleviate tension in the abdominal muscles, making it easier for the healthcare provider to perform a sensitive examination.

While the other positions mentioned may be suitable for different types of examinations or procedures, they are not the standard for abdominal and pelvic assessments.