My 15 year old daughter had physical this week and has 3+ protein in urine. She was on Atkins diet. Dr. told her to quit. She was also dehydrated. I have been looking on internet for answers and have come up with a possible link to dehydration. She is now drinking lots of water eating carbs and I am hoping when she has her recheck in 2 months she will be better. If not the doctor says a Creatinin blood test will tell if there is renal failure. She also had some blood in her urine which may be related to getting her period. Hope you find out your daughter is OK!!! I am hoping mine is also.