A 45-year-old approaches his family Physician regarding difficulty for the last 4 months when attempting to start urinating & then urinating for a long period of 12 to 15 min. He has no significant medical history & has no symptoms suggestive of UTI. pain or hematuria.

His family Physician prescribed Tamsulosin 400 mcg once daily for 2 weeks. What are the investigations that are required in this case?