<s>[INST] Hi,My brother has kidney stone (sand) smaller than 5 mm  How long does it take to pass it, how long does he need to wait to be done with the process. Is it reasonable to wait for it to pass by itself? Or should I have shock wave treatment without waiting? [/INST] Hello,Kidney stones more than 10 mm are treated with shock wave lithotripsy.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. Siddartha </s>