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Undetectable PSA after prostatectomy: what it actually means | CION Cancer Clinics
An undetectable PSA after prostatectomy means the blood test cannot find any PSA at all. The prostate makes PSA, so once the gland is out this result says no prostate tissue the test can sense is left in the body. It is the result most men get. This page explains why the report says "less than" rather than zero, what the result does and does not promise, and why the tests continue. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What does an undetectable PSA after prostatectomy mean?
- Three things on the report that change what "undetectable" means
- What happens at a follow-up visit when the PSA is undetectable?
- What an undetectable PSA tells you, and what it does not
- Four things men conclude from an undetectable PSA, and what is true
- What this page cannot tell you
- Common questions about an undetectable PSA
The short answer
What does an undetectable PSA after prostatectomy mean?
It means the blood test cannot find any PSA at all. The prostate is the organ that makes PSA, so after the whole gland is removed an undetectable result says that no prostate tissue the test can sense is left anywhere in the body. It is the result your surgeon hoped for, and the one most men get.
Why the report does not say zero
No blood test can measure nothing. Every laboratory has a floor, the smallest amount its machine can detect, and below that it prints "less than" followed by that floor. On a standard test the floor is a small fraction of a nanogram. On an ultrasensitive test it is smaller still. Either way, "less than" is the word to look for.
What it tells the team
That the operation removed the gland and any prostate tissue large enough to show in the blood. Read alongside the pathology report, it lets your surgeon set a normal follow-up schedule rather than a closer one, and it usually means no further treatment is planned for now.
What it does not promise
It cannot promise that no cancer cell remains anywhere. A very small cluster can sit below the test's floor for months or years, which is why the tests continue. An undetectable result is very good news that is confirmed, not replaced, by each test that follows.
Reading the report
Three things on the report that change what "undetectable" means
Which test the lab used
A standard PSA test and an ultrasensitive test have very different floors. "Less than" on one is not the same as "less than" on the other. Your surgeon chooses one and sticks with it, so that every result can be compared with the last.
Ask
- Which test my results are on
- Whether the district lab uses the same one
What the pathology report said
An undetectable PSA in a man whose report showed cancer confined to the gland with clear edges is read one way. The same result in a man with a positive margin or cancer in a lymph node is still good news, but the team watches more closely and may discuss extra treatment.
How many results are in the series
The first undetectable result is a single point. The third and fourth, spread over the first couple of years, turn it into a line. A flat line at "less than" is what the team is looking for, and each result adds to it.
Not sure whether this applies to you?
Ask an oncologistAt each follow-up
What happens at a follow-up visit when the PSA is undetectable?
The blood test, a few days before
Done at the clinic or at a laboratory nearer home, ideally the same one each time. Send the report ahead so the surgeon has it in front of them, not in your hand at the door.
The number, and the line it sits on
The surgeon confirms it is still "less than", and looks at the series so far. With an undetectable result this part of the visit is short, and that is a good sign.
Everything the PSA does not measure
Bladder control, erections, energy, mood and the wounds. This is usually the longer part of the visit, and the part men skip because they feel they should be grateful. Do not skip it.
The next date
Closer together in the first couple of years, then yearly if the results stay undetectable. You leave knowing when the next test is, and who calls whom with the result.
Side by side
What an undetectable PSA tells you, and what it does not
It tells you
It does not tell you
No prostate tissue the test can sense is left in the body
That no single cancer cell remains anywhere
No treatment is needed on the basis of the blood test right now
Whether radiation was ever discussed on the basis of the pathology report
Follow-up can run on the standard schedule
That follow-up can stop
The operation removed what it set out to remove
Anything about bladder control or erections
Good news, confirmed by each result that follows
What a later result will show
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Commonly believed
Four things men conclude from an undetectable PSA, and what is true
"It is undetectable, so I can stop the blood tests."
The tests continue for many years precisely because the result is good. A late rise is possible, and it is far easier to treat when it is caught at a very low level than after it has been climbing unnoticed. The test is inexpensive and takes minutes.
"It is undetectable, so the radiation my surgeon mentioned is off the table."
Sometimes, but not always. Extra radiation after surgery is discussed on the basis of the pathology report, such as a positive margin or spread beyond the gland, not on the PSA alone. Ask your team directly rather than assuming the conversation is closed.
"My ultrasensitive test shows a tiny number, so the cancer is back."
Ultrasensitive tests report very small wobbles that often mean nothing, and can vary between two samples taken on the same day. The team looks for a trend across several tests, not a single tiny reading. Do not change labs or tests mid-series.
"The PSA is fine, so the leaking must be fine too."
The PSA measures prostate tissue, nothing else. Bladder control and erections recover on their own timetable and need their own help. Raising them at follow-up is not ingratitude; it is the other half of recovery.
Did you know
Two PSA results from two different laboratories cannot be compared with confidence, even when both say "less than". The floors differ. If you must change labs, tell your surgeon, so the series is read with that in mind.
Being straight with you
What this page cannot tell you
It cannot tell you how likely your own PSA is to stay undetectable. That depends on the grade of the cancer, whether it reached the edge of the gland or the lymph nodes, and your PSA before surgery. Your surgeon can give you a sense of it from the pathology report; this page cannot.
Who is watched more closely despite a good result
Men with a positive margin, a high grade, cancer in the seminal vesicles or lymph nodes, or a high PSA before the operation. An undetectable result in this group is still the result everyone wanted, but the tests may be closer together and extra treatment may be discussed. That is caution, not bad news.
What to ask at the next visit
Whether anything in the pathology report changes how this result is read. Which test and which lab to use from now on. What kind of change would bring the next appointment forward. Whether the leaking or the erections are on the expected path, and what help exists if they are not.
If the result arrives on your phone before the appointment and you are unsure what "less than" means on your report, call the helpline. Someone will read it with you.Questions we are asked
Common questions about an undetectable PSA
Is undetectable the same as zero?
In practice, yes. No test can measure nothing, so the laboratory reports "less than" its lowest measurable level. That is what undetectable means, and it is the result your surgeon wanted. The exact floor is printed on your report and differs from lab to lab.
Does undetectable mean the cancer is gone?
It means no prostate tissue is producing enough PSA for the test to find. That is very good news. It cannot promise that no cell remains anywhere, which is why testing continues for years. Each further undetectable result makes the picture more reassuring.
My report says "less than" one figure and my brother-in-law's says another. Who is better?
Neither. You are looking at two laboratories with two different floors, not two different amounts of PSA. Both results are undetectable. Compare your own results with your own earlier ones, at the same lab, and leave other people's reports out of it.
How long will I keep having the test?
For many years, closer together at first and then usually yearly. The gap widens as the undetectable results add up, but the testing does not stop, because a late rise is possible and is far easier to deal with when it is caught early.
Do I still need scans?
Not while the PSA stays undetectable. Scans are for finding where cells are once the PSA has started to rise. In a man with an undetectable PSA they very rarely show anything, so they are not part of routine follow-up.
If it is undetectable, why is my surgeon still talking about radiation?
Because that conversation is driven by the pathology report, not the blood test. A positive margin or cancer beyond the gland can prompt a discussion about extra treatment even with a good PSA. Ask what the report showed and what the team weighs before deciding.
Can stress or diet make the PSA go up again?
No. With the prostate gone, PSA comes only from prostate tissue, so ordinary life does not move it. There is no food, supplement or habit that keeps it undetectable, and none that pushes it up. Anyone selling you something to "keep the PSA down" is selling you nothing.
I feel well and the PSA is fine. Can I skip the visit and just send the report?
Ask your surgeon; some visits can be done by phone. But the visit is also where leaking, erections and mood are checked, and those are the things men most often stay quiet about. Feeling well and being fully recovered are not the same thing.
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Sources
- National Cancer Institute — Prostate-Specific Antigen (PSA) Test
- American Cancer Society — Treating Prostate Cancer
- NICE — Prostate cancer: diagnosis and management (NG131)
- Cancer Research UK — Prostate cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Your PSA After ProstatectomyWhen the first test is done and how the schedule runsRising PSA After ProstatectomyWhat happens if a later result climbsPositive Margins on the Prostatectomy ReportWhy the pathology report changes how a good PSA is readDo You Need Radiation After Prostatectomy?The conversation that can continue despite an undetectable PSAFollow-Up Schedule After ProstatectomyEvery visit and test in the years after surgery
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Not sure what your PSA report is saying?
Send it to us or call the helpline. An oncologist will read it with you alongside your pathology report and tell you what, if anything, happens next. One helpline serves every CION centre.