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Computerized tomography (CT) scan. In patients who are not pregnant, a CT scan (a type of X-ray study) of the area of the appendix is useful in diagnosing appendicitis and peri-appendiceal abscesses as well as in excluding other diseases inside the abdomen and pelvis that can mimic appendicitis.
Laboratory Tests Used to Diagnose Appendicitis Doctors may use blood tests to check for signs of infection, such as a high white blood cell count. Blood tests may also show dehydration or fluid and electrolyte disorders. Other laboratory tests that are used to make an appendicitis diagnosis by ruling out other conditions include a urinalysis and a pregnancy test. Imaging Tests Imaging tests are also used for diagnosing appendicitis. X-rays, ultrasounds, and computed tomography (CT) scans are used to produce images of the abdomen. An x-ray can show signs of obstruction, perforation (a hole), foreign bodies, and, in rare cases, an appendicolith, which is hardened stool in the appendix.