<prompt> A child comes with hematuria following respiratory tract infection. He gives similar history about 5-10 months back also. All are true, except -C3 complement level normalProgressive renal failure with each attackBiopsy shows focal and diffuse proliferative change in 50 of patientAnti streptococcal antibody titre may not rise after each attack  <response>: Hematuria is defined as the presence of red blood cells in the urine originating from the kidney or the urinary tract Underlying conditions producing hematuria, like diabetes, can be associated with progressive decline in kidney function in the setting of CKD Ref Harrison20th edition pg 278 