What contrast agent is typically used for CT A/P during the diagnosis of appendicitis?

For the evaluation of appendicitis using a CT scan of the abdomen and pelvis (CT A/P), oral contrast agent is typically used to enhance the visibility of the gastrointestinal tract and potential abnormalities. Oral contrast helps outline the intestines, making it easier to identify inflammation, obstruction, or the presence of an appendiceal mass. This contrast improves the accuracy of diagnosing appendicitis by providing a clearer image of the surrounding structures.

In certain circumstances, additional intravenous (IV) contrast may be used in conjunction, but oral contrast is specifically beneficial for diagnosing appendicitis as it can help differentiate between appendicitis and other abdominal issues. It provides critical information regarding the condition of the appendix itself and any related complications.

Additionally, the use of gas contrast is not a standard practice for diagnosing appendicitis, and relying on no contrast could hinder the diagnostic capability of the imaging technique. Therefore, oral contrast stands out as the most common and effective choice for this specific diagnostic scenario in appendicitis.