Does anyone know what it means when your BUN and Creatinine levels are abnormally LOW?
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Most likely you're overhydrated. If you're a healthy individual. I would talk to your doctor about it though.

It has to do with your kidneys, so it could be dehydration or low protein intake. But it depends on how low and for how long. Definitely talk with your doctor first.

dehydration would cause a high bun and creatinine