The diagnosis of acute appendicitis is made primarily with the clinical history and physical examination. Patients with a high clinical probability of acute appendicitis should be surgically explored without the delay of any ancillary testing. Additional studies are largely confirmatory or are used to rule out other pathologic conditions when the diagnosis is less clear. These additional studies include a complete blood count (CBC), urinalysis (UA), pregnancy test for females, and various imaging studies. Clinical observation is another common diagnostic modality.
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