Hello @ira817, Welcome to Mayo Clinic Connect. I found the following information on the Cancer.gov site that may be helpful explaining the PSA numbers.

"In the past, most doctors considered PSA levels of 4.0 ng/mL and lower as normal. Therefore, if a man had a PSA level above 4.0 ng/mL, doctors would often recommend a prostate biopsy to determine whether prostate cancer was present.Oct 4, 2017"
- Prostate-Specific Antigen (PSA) Test - National Cancer Institute: https://www.cancer.gov/types/prostate/psa-fact-sheet

Have you discussed the latest PSA test results of 0.56 with your doctor?