Conditions affecting the prostate gland or blockage at the bladder outlet that may interfere with urination.
Because the rating depends on whichever dysfunction is predominant, the evidence that matters most is whatever documents the severity of your specific symptoms.
For voiding dysfunction involving urine leakage or incontinence, medical records or your own statements showing how many times per day absorbent materials must be changed are directly relevant. For urinary frequency, records of how often you void during the day and how many times you wake at night to void are key. For obstructed voiding, useful findings include post-void residual measurements (especially results above 150 cc), uroflowmetry showing peak flow rate below 10 cc/sec, records of catheter use, and notes about recurrent infections caused by obstruction.
For urinary tract infection as the predominant issue, hospital admission records, treatment notes showing continuous intensive management or suppressive drug therapy, and records of stent or nephrostomy tube drainage all speak directly to the rating levels. Notes from your treating providers describing symptom frequency, the duration of suppressive therapy, and any need for hospitalization help establish which level applies.
Statements from you or those who live with you describing how symptoms affect sleep, daily activities, and work can support and clarify what the medical records show.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.