Hi, Thanks for writing in. The kidneys are organs which filter out harmful and toxic substances from the blood In this way the urine is formed. This happens through a complicated process in the kidneys and involve stages like glomerular filtration. This is a micro system that causes blood components to flow through small and the main filtration occurs at basement membrane in the glomerulus. When there is proteins seen in the urine in higher quantities than normal then a problem in the basement membrane must be suspected. This also might happen in those who have had nephritis earlier in their life. Your kidney functions might be above normal and it is important to evaluate the excretion of proteins by doing a biopsy. It is done using ultrasound guidance and considered safe and less painful and done under local anesthesia. The biopsy will show any problems in the kidney glomerulus and basement membrane and guide your treatment. Please do not worry.