Which of the following is not a variant of PSA: (A) PSA density, (B) PSA nodularity, (C) PSA velocity, (D) Ratio of free to bound PSA
Answer is B. 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.