What best characterizes the leukocytosis in a patient with appendicitis?

In cases of acute appendicitis, the most characteristic finding in the laboratory examination is neutrophilia. Appendicitis is an inflammatory condition that typically triggers the body's immune response, leading to an increase in neutrophils, which are the primary white blood cells involved in the acute inflammatory response. This response is a direct result of the infection and inflammation of the appendix, which produces a demand for additional neutrophils to combat any bacterial pathogens present.

As neutrophils are often among the first responders to sites of infection or inflammation, their elevation in the bloodstream is a key indicator of acute conditions, including appendicitis. This leukocytosis, particularly marked by an increase in neutrophils, is a vital part of the diagnosis and management of the condition.

In summary, neutrophilia best characterizes the leukocytosis observed in appendicitis due to the acute inflammatory response elicited by the condition, making it a hallmark finding in diagnosing this surgical emergency.