Obstruction is a possibility also hinted, afaik, by a large urea/creatinine ratio in the urine. I am taking
tamsulosin 0.4 mg/d and testing with my doctor 0.8 mg/d to check PVR. I have had regularly and also recently DREs which were all normal.
I am 56, otherwise healthy, moderately active, fit and eating a well balanced diet with relatively high protein intake (Zone).