Thanks for your query.From all the lab reports it is clear that your uncle is in what is called as Chronic Renal Failure
which is end Stage Renal Paranchymal Disease.There is no medical treatment that can be followed at home.and needs frequent Dialysis
to wash out end Products of Protein metabolism
that are excreted through Urine.Since he is 80 yrs old possibility of Renal Transplant is out of consideration. There are many charitable organisations who help these patients.Pl try to get financial help from them.