Blastomycosis - contd.
A presumptive diagnosis can be made based on the animal's clinical signs, history, geographical region of the country, and serologic tests. A CBC, or complete blood count, and chemistry panel are usually performed. Many animals will have an elevated white blood cell count, and elevated calcium levels are sometimes seen. Because respiratory disease is the most common manifestation of infection, chest x-rays are usually taken. X-rays of the abdomen, limbs, or other parts of the body may be indicated if the animal is showing signs in these areas.
A definitive diagnosis is made by identification of the Blastomyces dermatidis organism through biopsy, fine-needle aspiration, or culture. Occasionally, imaging tests, such as a CT scan or nuclear scintigraphy, may be performed to better identify which tissues are infected and to monitor treatment. This equipment is typically available only at universities or large referral institutions.
