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NAVLE（北美执业兽医考题）Day 615
单选题，正确答案是100分，非正确答案为0分，Good Luck！
A 10-year old male castrated cat that you have previously diagnosed with hyperthyroidism presents to you for acute onset of blindness. You perform an ophthalmic exam and note retinal hemorrhage. What diagnostic test should you perform first？一只10岁的已绝育公猫之前被你诊断出患有甲亢，这次由于急性失明前来就诊。你做完眼科检查后发现他有视网膜出血的情况。你需要首先进行什么诊断性检查？
