Hi dear, Thanks for choosing HCM. I have read your question well and understand your concern and i will do my best to assist you. There are few questions i would like to ask to better understand your case such as has your son lost weight recently? you said his weight was 94KG? has he lost or gained weight in the last 6 months? Does he have any history of Diabetes, Rhematoid Arthritis, does he take any medications that reduce his immunity? Now if i answer based on the information you provided. First of all, one thing you should know is that male Urinary tract infection are mostly difficult trace or manage compared to females, it s more likely to see a recurrent female infection than male. I don t know what made your doctor to treat your son with only antibioitc medications, if i was your Doctor i would consider admitting him to hospital so that i can take all necessary tests required, i would aslo consider treating him by giving him IV solution to help him rehydrate and IV antibiotics to better eradicate the pathogen, specially that he was sick for that long. the IVU test the doctor ordered is a good choice to look for any abnormalities in the whole urinary tract including kidneys. Here is few things i would do if you came to my Hospital, you can consider discussing the following with your Doctor. 1.Admit to hospital immidiately, so that i can give IV fluids and IV antibiotics and run tests such as CBC, Urine analysis, Urine culture, IVU. 2. Since your son had reccurent UTI, i might consider doing some other tests to see if he has other commorbidities such as diabetes , Tuberclosis etc. 3.Some patient that had reccurrent UTI might actually have something called Fistulas caused by a disease known as Crohns disease. Therefore if IVU shows normal results, i will refer him to Gastroentrology specialist to do Colonscopy.specially if your son suffers from diarrhea Crohns disease is an Inflamatory Bowel disease that causes severe abdominal pain and could lead to forming fistuala (holes between intestines and urinary tract) that might cause some bacterias from the Intestines to reach to the urinary tracts thus cause an Urinary tract infection. I hope you can discuss the points i mentioned with your current Doctor so they can consider it. Wish you all the best and i hope your son gets better soon .