What is the link between BUN and urea?

What is the link between BUN and urea?

In this video, Dr. Sunil Dargar, MBBS, MD, Pathologist, New Delhi, discusses the relationship between BUN and urea. Urea is a protein waste metabolite with nitrogenous molecule are attached. In urea, the percentage of blood urea nitrogen (BUN) is approximately 48%. If the blood reports shows blood urea is 40, then BUN will be approximately 19-20. Both expresses almost the same thing, as few countries use blood urea or BUN as an expression but few other countries use blood urea as an expression.