Which of the following is not a variant of PSA
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 whetherprostate cancer was present.
PSA density
PSA nodularity
PSA velocity
Ratio of free to bound PSA
Urinary tract