Talk to Urologist on Weak Urine Stream - Elevated PSA

Dear Drs,

My father, age 75, bp patient, no sugar, complained of weak Urine stream 4-5 days ago. RFT was done recently, results completely normal. Upon physical check up with general physician, he performed an ultrasound, and diagnosed enlared prostate, recommend PSA test.

PSA result is 12.2. RFT normal Overall fit and fine

Symptoms, weak urine stream, no pain, no incontinence, no urgency, no frequent urination, however, he feels bladder is not fully emptied.

Now, I want your guidance, in what direction should I get the treatment done.

Also, pls guide on following; Is this PSA level related to Benign enlarged prostate? or could it suggest prostate cancer? How to rule out from both without biopsy?

What are the first steps in the treatment that should be taken?

Not willing to go for biopsy as of now. Any suggestions are welcome.

JazakAllah.