what is a dangerous high bun level?

A high BUN (blood urea nitrogen) level can indicate that your kidneys are not working properly. However, the danger posed by a high BUN level depends on its trigger. A dangerously high BUN level, often starting from 50 mg/dL, indicates kidney damage that should be addressed immediately. If you have a BUN between 100 mg/dL to 250 mg/dL, it could be due to severe kidney dysfunction, specifically involving its ability to filter waste products. A BUN level over 20 mg/dL is considered abnormal and can point to some harmful conditions. If you have an extremely high BUN level, say between 50 mg/dL to 100 mg/dL or even higher, it suggests kidney impairment, while anything higher indicates kidney failure, which could be fatal if left unchecked.