One hundred and ninety cases of rabbits, seen at animal hospitals in Saitama and Tokyo, Japan from 1998 to 2001, with BUN values greater than 27 mg/dl were analyzed regarding their underlying and/or complicating diseases and outcomes. Gastrointestinal disorder (54 cases) was the most common disease, followed by overgrowth of molar teeth and then liver disturbance. The total mortality was 48.9% within three months, and cases showing complications such as liver disturbance or bacterial infection

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... howed highest mortality. Cases with higher BUN values showed even higher mortality, although mortality varied depending on the complications. Therefore, the prognosis of rabbit cases with high BUN values should be evaluated based on findings from blood chemistry, together with the seriousness of the underlying and/or complicating disease.