If there had been a total prostate removal, yes, the PSA would over time come down in the best cases to virtually zero. But a TURP only removes enough tissue to allow proper urine flow. The prostate remains.
The irritated / aggravated prostate is healing from the TURP, but it is still throwing off higher than normal levels of PSA. The docs will likely start talking about
some antibiotics if you insist on treatment. If the PSA comes down, BPH remains a possible cause.
And remember that a PSA of 4 with a fairly recent clear biopsy (and the clear results from the TURP) in an 80 year old is not unusual.
So test again in a few months. Until then, I don't see an issue.
Moderator - Prostate Cancer(Not an MD )
IGRT journey (2010) - https://www.healingwell.com/community/default.aspx?f=35&m=1756808
HT (Lupron) 9/12-3/13, 6/14 to present
Prolia 6-mo inj 12/12 to present
Casodex 12/14, end 3/15
Zytiga 4-7/15 Xtandi 4/16-8/17
RT - T12,L3,4,5 mets 9/18, 5/19