Only the prostate gland releases PSA, so your numbers should drop to almost zero within 4 weeks after your surgery. A test result above 0.2 ng/mL a few months after your procedure could be a sign...

PSA has a half-life of about 2.2 days, so the level drops by half every 2.2 days after the prostate is removed. By 6 to 8 weeks post-operatively, more than 99% of pre-operative PSA has cleared, and your true post-surgical baseline can be measured.

Because some PSA can remain in the blood for several weeks after surgery, even if all of the prostate cells were removed, doctors often advise waiting at least 6 to 8 weeks after surgery before checking the PSA level.

Ideally, your post-prostatectomy PSA will be undetectable, or less than 0.05 or 0.1 nanograms of PSA per milliliter of blood (ng/mL). If that’s the case, your doctor may call it a remission.

In this article, we discuss why PSA testing is important after a prostatectomy and what the results can mean. We also cover treatment and prevention of rising PSA levels.

After a radical prostatectomy, your PSA should drop to virtually undetectable levels, typically below 0.01 ng/mL. A PSA reading that reaches 0.2 ng/mL or higher, confirmed on a second test, is the standard threshold for biochemical recurrence, meaning cancer may have returned.

After a radical prostatectomy, the prostate gland has been removed, and with it, the primary source of PSA. As a result, PSA levels are expected to fall to very low or undetectable levels, typically below 0.1 ng/mL, within six to eight weeks.

A physician-reviewed guide to PSA after prostate removal, including expected decline, detectable results, biochemical recurrence definitions, doubling time, imaging, and follow-up questions.

Standard PSA assays report “undetectable” at <0.1 ng/mL; ultrasensitive assays report at <0.01 ng/mL. The two numbers are not interchangeable. A PSA that stays detectable at 6 weeks post-op (≥0.1 ng/mL) is “persistent PSA” and carries a worse prognosis than a PSA that rises later.

This page explains how PSA is interpreted after a radical prostatectomy, what level prompts closer attention, and why a low but detectable result is rarely a reason to act straight away.