PSA levels are measured in ng/mL. Generally, a PSA level below 4.0 ng/mL is considered normal, while levels above 4.0 ng/mL may indicate the need for further testing. However, the interpretation of PSA levels is complex and depends on various factors, including age, race, and family history. Elevated PSA levels do not necessarily mean a man has prostate cancer; further diagnostic tests, such as a biopsy, may be necessary.
