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What does my PSA level mean?

PSA, prostate specific antigen, is a protein made by the prostate. The number most men have heard is 4.0 ng/mL, treated as the line between normal and abnormal. Many clinicians also use age-specific thresholds, roughly under 2.5 in your forties, under 3.5 in your fifties, under 4.5 in your sixties, and under 6.5 in your seventies.

Here is what actually matters about that number. PSA is prostate specific. It is not cancer specific. That single distinction explains most of the confusion and most of the anxiety around this test.

4.0 is a convention, not a cliff

Risk rises continuously with PSA. There is no biological event at 4.0. Plenty of men with a PSA of 5 have nothing but an enlarged prostate, and a meaningful number of cancers are found in men whose PSA never crossed 4. Treating that number as a pass-fail line produces two bad outcomes: unnecessary alarm in men who are fine, and false reassurance in men who are not.

What tells us more than any single value is the trend. A PSA that has climbed steadily over three years means something different from one that has sat still, even if both land on the same number today. This is another reason I ask for your old labs rather than just the current one.

Common reasons PSA is elevated that have nothing to do with cancer

Benign prostatic hyperplasia, the ordinary enlargement of the prostate that happens to most men with age, is by far the most common cause of a raised PSA. Prostatitis, meaning inflammation or infection of the prostate, can push it up substantially and then bring it back down once treated. A urinary tract infection does the same.

There are also mechanical causes that are entirely avoidable if anyone had told you. Ejaculation within about 48 hours of the draw raises PSA. So can vigorous bicycle riding, a recent catheter, a recent prostate exam, or a recent biopsy. A man who rode 30 miles on Saturday and got drawn Monday morning can get a result that frightens him for no reason. Ask about timing before the blood is taken, not after.

Things that falsely lower PSA, which is the more dangerous direction

This gets missed constantly and it deserves attention.

Finasteride and dutasteride, the 5-alpha reductase inhibitors, roughly cut PSA in half. Many men take finasteride for hair loss and have no idea it affects this test. If you are on one of those and your PSA reads 2.0, the meaningful number is closer to 4.0, and it has to be interpreted with that adjustment. A man on finasteride whose PSA is read at face value can be reassured right past a real finding.

Saw palmetto, taken by many men for hair loss or prostate symptoms, can lower PSA through a similar mechanism. Significant excess weight lowers it too, through simple dilution in a larger blood volume. None of these are reasons to avoid those things. They are reasons your doctor has to know about them.

The screening debate, told honestly

You deserve both sides of this rather than whichever one supports what someone wants to sell you.

The case for screening: prostate cancer is common, it is often curable when caught early, and screening has been associated with reduced deaths from it.

The case against screening everyone: many prostate cancers grow so slowly that they would never have harmed the man in his lifetime. Finding them can lead to biopsies, and to surgery or radiation carrying real risks of incontinence and erectile dysfunction, for a disease that was never going to hurt him. That is overdiagnosis, and it is not a hypothetical.

Where the guidelines landed is a shared decision between roughly 55 and 69, made with your values and your risk in the room, with earlier discussion for men at higher risk, which includes Black men and men with a father or brother who had prostate cancer, and generally no routine screening past 70 or in men with limited life expectancy. Modern practice has also gotten better at avoiding unnecessary biopsy: a percent free PSA, PSA density, the rate of change over time, and MRI imaging are all used to sort out who actually needs one. An elevated PSA today is a reason for a conversation, not a reason for panic.

PSA and testosterone therapy

This comes up in my office constantly, so let me address it directly.

For decades men were told testosterone causes prostate cancer. That belief came from limited early observations, and the evidence has shifted considerably. The current understanding is that prostate tissue is saturated at relatively low testosterone levels, so raising a deficient man into the normal range does not appear to feed cancer the way the old model predicted. A large randomized trial published in 2023 that followed thousands of men on testosterone therapy did not find an increase in prostate cancer events.

That is reassuring, and it does not mean the question goes away. Standard practice is still a baseline PSA before starting therapy in men over 40, a discussion of your individual risk, and PSA monitoring during treatment, with a meaningful rise triggering evaluation. Testosterone is not given to a man with active untreated prostate cancer. Anyone who starts you on testosterone without a baseline PSA is skipping a step that exists for your protection.

What belongs alongside it

What we look at	Why it matters
Your prior PSA results	The trend over time says more than any single value
Percent free PSA	Helps distinguish benign enlargement from something needing biopsy
Digital rectal exam	Finds abnormalities PSA can miss entirely
Urinary symptoms and history	Flow, frequency, and night waking point toward benign enlargement
Medication list	Finasteride, dutasteride, and saw palmetto all lower the number
Family history and ancestry	Changes when screening should start and how closely to follow
Testosterone panel	Baseline and monitoring if hormone therapy is on the table

This page is education, not your interpretation

Everything above explains what PSA measures and what moves it. It is not a reading of your result and it is not a diagnosis. An elevated PSA is a starting point for evaluation, and a normal one does not close the subject. That judgment requires your history, your exam, your medications, and your prior results.

The next step

If you have a PSA that came back high and you have been worrying about it, or if you are on finasteride and nobody adjusted for it, bring the labs in. A physician lab review means we go through what you already paid for, I tell you what the number is likely reflecting, what would need to happen next, and what does not need to happen at all. If testosterone therapy is what brought you here, this is part of that same conversation.