My father had surgery 3 months back for infection inside urinary tube and it's removed and other process replaced. Recently we done tests for follow up he has 82 ml post residue and some echoes floating near bladder wall, he has foul smell urine. Most importantly he has PSA level as 4.2 ng ml is it dangerous or normal at this age. Please confirm. Serum creatine is 1.6 which is lower before don't know reason why it's increased.