What is the primary diagnostic method for appendicitis?

• A. Ultrasound of the abdomen
• B. CT abdomen and pelvis with oral contrast
• C. MRI of the abdomen
• D. Blood tests for white blood cell count

Answer: (B)

The primary diagnostic method for appendicitis is a CT scan of the abdomen and pelvis with oral contrast. This imaging modality is highly sensitive and specific for diagnosing appendicitis and can clearly visualize the appendix, the surrounding structures, and any potential complications such as abscess formation. A CT scan can provide a definitive diagnosis and help differentiate appendicitis from other causes of abdominal pain, which is crucial in an emergency setting.

In contrast, while an ultrasound can be utilized, particularly in pediatric patients to avoid radiation exposure, it is generally less sensitive than a CT scan and may not be able to visualize the appendix well in adults. MRI of the abdomen is not commonly used for diagnosing appendicitis, as it is more expensive and less accessible in emergency settings compared to CT. Blood tests, such as evaluating white blood cell counts, can suggest infection or inflammation but are not specific enough to confirm appendicitis on their own. Thus, while they can provide ancillary information, they are not the primary diagnostic tool.