Dear S Krishnan, Welcome to healtcaremagic forum...
and BUN indicates renal failure
.. The severity of the condition is predicted by GFR... Dialysis
is needed, if one has symptoms of fluid overload, electrolyte abnormalities, or when the GFR is very low - less than 10-15ml/min (normal 120ml/min).
with GFR above 20 can be managed conservatively with fluid and dietary restriction, risk factor control and other supportive medications...
Wish you good health..