Hi, I have been loosing anywhere from 300mg to 800mg of protein in my urine per 24 hours for about 4 years now. My creatinine and GFR and all other markers are always perfect (thank God). I'm wondering how my kidneys are showing damage (by the proteinuria) but my blood tests are always perfect. I do not want to have a biopsy right now, and my nephrologist doesn't really think I need one either at this point. We both believe I have IgA nephropathy. I just don't understand why I'm loosing so much protein, but my kidney "function" by way of the blood tests are always really good?