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NAVLE Exam FREE NAVLE Small Animal Internal Medicine Questions and Answers

A 7-year-old intact female Labrador Retriever presents with polyuria, polydipsia, and a history of recurrent urinary tract infections.
On physical examination, she is bright, alert, and responsive, with no significant abnormalities noted.

Blood work reveals hyperglycemia (350 mg/dL) and glucosuria.

Urinalysis shows a specific gravity of 1.010 and bacteriuria.

What is the most appropriate initial diagnostic step to differentiate between diabetes mellitus and Cushing's disease as the cause of these signs?

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