Which diagnostic test result would support a diagnosis of Hepatozoon americanum?

A diagnosis of Hepatozoon americanum, a protozoan parasite of dogs, is often supported by specific changes in the complete blood count and other laboratory findings. Neutrophilia, which is an increased number of neutrophils in the blood, can indicate a reactive response to infection or inflammation. In the case of Hepatozoon americanum infection, neutrophilia can occur as the body responds to the parasite. This is a common hematological finding in many infectious conditions.

In contrast, elevated ALT primarily indicates liver damage or dysfunction, which can occur in various conditions but doesn’t specifically point to Hepatozoon americanum. A low white blood cell count can suggest various issues, including bone marrow suppression or severe infections, but would not be typical for a parasitic infection like Hepatozoon where one would expect an inflammatory response. A high platelet count is often seen in response to inflammation or infections but is not as directly associated with Hepatozoon as neutrophilia is.

Thus, neutrophilia is a more relevant laboratory finding that effectively supports the diagnosis of Hepatozoon americanum, as it indicates an active immune response to the parasite.