<s>[INST] Hi doc,good evening.I want to know if 2+ protein in my sons urine is dangerous.He had been test for C3 this month and he is of normal range.But he has a kidney stone measuring abour 2 cm.Also his diet is only fish and vegetable,less salt too.He rarely eats meat.Please help me.Been to the doctor for 5 times now,thanks a lot [/INST] hi doubleM, 2cm kidney stone is a large stone, it needs to be treated even if it is not causing symptoms. The protein in urine may be due to the stone or stone-related urinary infection. Consult a urologist. take care. </s>