NAVLE® Question of the day

A two-year-old male neutered domestic shorthair cat presents after a suspected fall from a height of approximately 35 feet (over ten meters).

After initial stabilization (~four hours) with IV fluids and oxygen therapy, the cat has not urinated and there is no palpable urinary bladder.

An abdominal focused assessment with sonography for trauma, triage, and tracking (AFAST) reveals a moderate volume abdominal effusion, with no visible urinary bladder.

What test would confirm the top differential?

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