What should be done to avoid having poteins in the urine after 24hr urine collection, does medicines render the amount back to normal to below 30mg?

Proteinuria: Proteinuria (p) is a sign of kidney disease, not a diagnosis. P may be caused by a disease of the kidneys called glomerulonephritis (g) and other times it may caused by diabetic kidney disease. Go and see a nephrologist to have some blood tests ordered to see if the cause of your p can be found and then treated. If your p is due to diabetes, medicines such as ace-inhibitors an arb's can lower p.