It's a very good question. % free PSA is an improvement over PSA alone. Still better is a blood test called Prostate Health Index (PHI). PHI includes both PSA and % free PSA. It is less affected by prostatitis. It's still not a great test, but it's better than the other two, it's inexpensive, and covered by insurance. Here's info on it if your urologist doesn't know how to order it:
/www.accureference.com/phi/There are other biochemical tests (e.g., 4Kscore, PCA3, etc.) but they are all more expensive, not covered by insurance before a first biopsy, and no more accurate.
I hope the antibiotics bring it down.