the indication for nephrectomy
is not clear . is it stone disease or tumor. in any case if now you are haveing 4 plus urine protein, first step is to confirm it by a 24 hrs urine protein and creatinine ratio. and see in urine RBC are dysmorphic by urine testing. if fings show more that 2gm proteinuria
with dysmorphic rbc in urine, then you might be having glomerulonephritis
( Intrinsic disease of the kidney).
treatment and medicine will depend on the type and cause of glomerulonephritis. i would sugest please meet your nephrologist
at the earliest.