NAVLE（北美执业兽医考题）Day 716

A 7-year old female spayed Standard Poodle presents with weakness and lethargy. A chemistry panel shows a Na+ = 130 mEq/L (142-152 mEq/L), K+ = 6.5 mEq/L (3.9-5.1 mEq/L), BUN 55 mg/dl (8-28 mg/dl), creatinine 1.9 mg/dl (0.5-1.7 mg/dl). The test to run for a definitive diagnosis would be which of the following?
一只7岁已绝育雌性标准贵宾犬由于虚弱和嗜睡前来就诊。其血液生化结果显示Na+ = 130 mEq/L (142-152 mEq/L), K+ = 6.5 mEq/L (3.9-5.1 mEq/L), BUN 55 mg/dl (8-28 mg/dl), CREA 1.9 mg/dl (0.5-1.7 mg/dl). 接下来要做的帮助确诊的检查是哪个？