1. Why do dialysis patients require to have their BUN and Creatinine levels measured before and after dialysis treatment? 2. Before their dialysis treatment, some patients have a Creatinine level...

1. Why do dialysis patients require to have their BUN and Creatinine levels measured before and after dialysis treatment?

2. Before their dialysis treatment, some patients have a Creatinine level exceeding 500 umol/L (Normal Range is approximately around 62-106 umol/L). Why do you think this happens?