PSA (Total + Free + % Free)MALE
A protein produced by the prostate. Total, free and %-free together improve specificity for distinguishing benign enlargement from something requiring investigation.
Baseline and monitoring PSA is standard of care before and during testosterone therapy. Testosterone doesn't appear to cause prostate cancer, but can accelerate growth of an existing undetected cancer — so you establish a baseline first.
Check a PSA (Total + Free + % Free) result against this range →
What PSA (Total + Free + % Free) actually measures — the analyte, and the assay
PSA is a serine protease made by prostate epithelium, and the assay reports it in three forms. Most PSA in serum is complexed to alpha-1-antichymotrypsin; a minority circulates free. Total PSA counts both, free PSA counts the uncomplexed fraction, and percent free is their quotient — which means percent free carries the error of two sandwich immunoassays, not one Deng 2023.
The single most important fact about the number is that it depends on the calibrator. Recalibrating the same assays from the traditional Hybritech standard to the WHO reference materials lowered reported total and free PSA by 20–25% Stephan 2009. Same serum, same instrument, same man — a fifth of the number gone, because a different vial was used to set the curve.
That is not a laboratory curiosity, it changed who got a biopsy. The clinical impact of the WHO standardization on biopsy rates and cancer detection was measured directly, because a fixed 4.0 ng/mL threshold applied to a number that has shifted downward refers fewer men Jansen 2008.
Free PSA is the fragile half. It is less stable than total PSA and the ratio drifts if serum sits or is stored warm, so a percent free from a sample that traveled is not the same measurement as one run promptly Deng 2023.
PSA (Total + Free + % Free): what changes the blood, and what only changes the reading
What changes the PSA in you:
- Prostate volume, which is the largest single determinant in men without cancer and rises with age.
- Prostate cancer, which is what the test is for.
- Inflammation and infection. Acute prostatitis can raise PSA many-fold and it can take 6 to 8 weeks to settle.
- Mechanical disturbance. Ejaculation, prolonged cycling, vigorous digital rectal examination, catheterization and cystoscopy all release PSA; the effect is largest and longest for instrumentation.
- 5-alpha-reductase inhibitors, which halve it. Finasteride and dutasteride reduce PSA by roughly 50% within 6 to 12 months, and the conventional correction is to double the measured value — but the relationship is not a clean constant, and the effect of dutasteride on PSA's usefulness for detecting high-grade disease was studied specifically because of it Andriole 2011 Andriole 2010.
- Testosterone therapy, which raises PSA modestly in most men as the prostate responds to restored androgen.
What changes only the reading:
- The calibrator. WHO-standardized and Hybritech-standardized results differ by 20–25% for the same serum Stephan 2009.
- The platform. Four assays measuring total and free PSA on the same samples do not agree closely enough to be interchangeable, and the disagreement is worse for percent free than for total Deng 2023.
- Sample age and storage, which degrade free PSA faster than total and therefore move the ratio Deng 2023.
- Heterophile and anti-animal antibodies, which bridge a sandwich assay and produce a falsely high result Ghazal 2022.
- Biotin, on streptavidin-based platforms Li 2020.
- Applying the doubling correction to a man who stopped his 5-ARI, or failing to apply it to a man who is taking one Andriole 2011.
Reference interval or decision threshold — which kind of number PSA (Total + Free + % Free) is
The 4.0 ng/mL line is a historical decision threshold and it is not a reference interval. It was chosen for a screening program, not derived from the distribution in healthy men, and it has no biological meaning — cancer exists below it and most men above it do not have cancer.
The threshold is also arithmetically unstable, because the number it grades moved by a fifth when the calibrator changed Stephan 2009 Jansen 2008.
The outcome data are the part worth knowing before anyone acts on a result. In the European Randomized study of Screening for Prostate Cancer, screening reduced prostate cancer mortality, with the benefit growing over 16 years of follow-up and the numbers needed to invite and to detect falling with longer follow-up Hugosson 2019. The Rotterdam section's 21-year analysis set out the morbidity alongside the mortality — overdiagnosis and the treatment that follows it de Vos 2023. Both numbers are real and they point in opposite directions.
Percent free and PSA density are refinements of a threshold, not thresholds of their own. They exist to sort men already above the line, and their cut-points are method-specific Deng 2023.
How you would know your PSA (Total + Free + % Free) was wrong — and when to redraw
Six weeks, and the reason is a half-life of 2 to 3 days plus the time inflammation takes to settle. Serum PSA falls with a half-life measured in days, so a value raised by ejaculation or cycling returns to baseline within about a week; a value raised by prostatitis needs 6 to 8 weeks.
Before the redraw: 48 hours without ejaculation or cycling, no digital examination on the day, and no recent instrumentation. A confirmed elevation on a properly prepared repeat is a different finding from a single raised value.
Conditions that must match: the same assay and the same calibration Stephan 2009 Deng 2023; the same laboratory; and the same 5-ARI status — starting or stopping one resets the baseline Andriole 2011.
What would have to change for the second number to mean something:
- Raised once? A properly prepared repeat resolves a large share of elevations without any imaging at all.
- Still raised? The next step in current practice is imaging before biopsy, not a third PSA. Percent free and PSA density help sort the intermediate range but do not replace it Deng 2023.
- On finasteride or dutasteride? Any value that has not been doubled is being read against the wrong scale, and a PSA that fails to fall by about half on treatment is itself the abnormal finding Andriole 2011 Andriole 2010.
- On testosterone therapy? A modest rise is expected. What matters is the trajectory across several draws, and the CBC hematocrit is the other number being watched on the same schedule.
- Result wildly out of keeping? Ask the laboratory to repeat with a heterophile blocking step before anything else happens Ghazal 2022.
What PSA (Total + Free + % Free) cannot tell you
It cannot distinguish cancer from benign enlargement or inflammation. All three raise the same protein, and volume alone explains most elevations in older men.
It cannot identify which cancers matter. That is the overdiagnosis problem the 21-year Rotterdam analysis quantifies: some cancers found by screening would never have caused harm, and treatment for them causes harm reliably de Vos 2023.
A normal PSA does not exclude prostate cancer, including high-grade disease, and a man on a 5-ARI has a number that has been halved by the drug Andriole 2011.
It cannot be trended across a laboratory or calibrator change. A 20–25% step in a series is the calibrator, not the prostate Stephan 2009.
The wrong inference readers actually draw is that a single number above or below 4.0 settles something. It does not: the threshold is a screening convention applied to a value that shifts by a fifth with the calibrator, moves with an ejaculation, halves on a common hair-loss drug, and derives whatever authority it has from trials whose benefit and harm both take two decades to show up Hugosson 2019 de Vos 2023.
Sources read for these sections
- Stephan C, et al. 20-25% lower concentrations of total and free prostate-specific antigen (PSA) after calibration of PSA assays to the WHO reference materials. International Journal of Biological Markers 2009 · PMID 19634108
- Jansen FH, et al. Clinical impact of new prostate-specific antigen WHO standardization on biopsy rates and cancer detection. Clinical Chemistry 2008 · PMID 18927249
- Deng L, et al. Consistency and diagnostic accuracy of 4 assays in the detection of the total and free prostate-specific antigen. Translational Andrology and Urology 2023 · PMID 36915871
- Hugosson J, et al. A 16-yr Follow-up of the European Randomized study of Screening for Prostate Cancer. European Urology 2019 · PMID 30824296
- de Vos II, et al. A Detailed Evaluation of the Effect of Prostate-specific Antigen-based Screening on Morbidity and Mortality of Prostate Cancer: 21-year Follow-up Results of the Rotterdam Section of the European Randomised Study of Screening for Prostate Cancer. European Urology 2023 · PMID 37029074
- Andriole GL, Bostwick D, Brawley OW. The effect of dutasteride on the usefulness of prostate specific antigen for the diagnosis of high grade and clinically relevant prostate cancer in men with a previous negative biopsy: results from the REDUCE study.. J Urol 2011 · PMID 21074214
- Andriole GL, Bostwick DG, Brawley OW. Effect of dutasteride on the risk of prostate cancer.. N Engl J Med 2010 · PMID 20357281
- Ghazal K, et al. Hormone Immunoassay Interference: A 2021 Update. Annals of Laboratory Medicine 2022 · PMID 34374345
The plan of attack
In this order. Most people start at step four, which is why they change five things at once and learn nothing.
- Confirm the number is real
Ejaculation, cycling or a digital rectal exam. Ejaculation within 48 hours, a long ride, or an examination before the draw all raise PSA — sometimes enough to move a man across a biopsy threshold on a number that was never his baseline. Abstain 48 hours, avoid cycling for 48 hours, and draw PSA BEFORE any examination, not after. - Read it with its partner
A rising PSA velocity on TRT warrants urology referral — that's the signal, not a single value. Draw it alongside: Total Testosterone, Total & Free DHT. - Work out which direction is yours
If it's high — Requires urological evaluation — but rule out the benign causes above first, since they're far more common.
If it's low — Reassuring. Note finasteride/dutasteride roughly halve PSA — you must double the reported value to interpret it correctly. This is a consequential and frequently missed detail. - Fix it in this order
Nutrition. Cooked tomatoes/lycopene, cruciferous vegetables, and reduced saturated fat have modest observational support for prostate health.
Lifestyle. Maintain a healthy weight and exercise; both associate with lower BPH and prostate cancer risk.
Supplements. Saw palmetto for BPH symptoms (mixed evidence). Avoid high-dose supplemental selenium and vitamin E — the SELECT trial found no benefit and possible harm.
Hormones. 5-alpha-reductase inhibitors reduce prostate volume and PSA. Manage TRT with periodic PSA monitoring per your physician.
Compounds. Get a baseline before starting TRT, then monitor (commonly at 3–12 months, then annually). Abstain from ejaculation and cycling for 48h before the draw to avoid a false alarm.
Work down the list, not across it. Adding a compound on top of an unfixed diet is why generic protocols fail. - Retest
Baseline, 3–12 months after starting TRT, then annually. Change one thing at a time, or the retest can't tell you which thing worked.
How to fix it
📚 Endocrine Society Testosterone Therapy CPG — prostate monitoring. Thompson IM et al., NEJM 2004 — PSA and finasteride.
This page can tell you what could have made your PSA (Total + Free + % Free) wrong. It cannot tell you whether it did.
Everything above is free and stays free — the assay, what changes the reading rather than the blood, the retest window and the sources. What no page can do is look at your draw: which laboratory ran it, at what hour, what you were taking that week, and what else was flagged beside it. Every one of those changes the answer, and none of them is on any page. Bringing a real result to people who know that list is what the members' area is for.
Bring your result — $10/mo →🩸 Test your PSA (Total + Free + % Free)
Order directly through Marek Diagnostics — no doctor's visit needed, drawn at any Quest location in the US. Code CAMERON applies 10% off automatically.
Order this test — 10% off → Browse all 103 markers →What PSA (Total + Free + % Free) is usually tested alongside
One marker is a data point. These panels add the markers that make PSA (Total + Free + % Free) interpretable, name why each is on the list, and load the set into your cart at 10% off.
includes this + 6 more markers · built for men — Over 45, or over 40 with a family history. Also anyone with urinary changes — weak stream, frequency, waking at night to urinate.
includes this + 10 more markers · built for men — You've decided to start testosterone therapy. Draw this before your first injection.
What people use PSA (Total + Free + % Free) to decide
Nobody orders a test for its own sake. PSA (Total + Free + % Free) is on the test list for these pathways — each one links to what the pathway claims, and what its test list is read for before you spend anything on it.
The androgen-receptor CAG repeat length is a one-time genetic test that predicts how sensitive your follicles — and your prostate — are to a given DHT level. It explains why two men with identical bloods have completely different outcomes.
This is the class where a before-and-after matters most, because the whole proposition is unverified. If a testicular bioregulator does what the program claims, LH and testosterone are where it would show.
What moves your PSA (Total + Free + % Free)
2 supplements in the Vault have a documented effect on this marker, or are a reason to have measured it first:
Browse all 278 compounds & 371 supplements →
Would you feel it? Symptoms PSA (Total + Free + % Free) helps explain
People search for how they feel, not for a marker. These are the complaints where this one is worth checking, and whether it is first-line or a follow-up.
Why your PSA (Total + Free + % Free) might be wrong
Most abnormal results are interference, not disease. Check these before you change anything. Each says whether the number is wrong (repeat it), badly timed (redraw it), or real with a cause.
Finasteride and dutasteride roughly HALVE PSA within six to twelve months. An untreated-looking PSA on one of these drugs is therefore about double what it appears.
On a 5-ARI, double the result before comparing it to any reference range, and tell whoever reads it.
Ejaculation within 48 hours, a long ride, or an examination before the draw all raise PSA — sometimes enough to move a man across a biopsy threshold on a number that was never his baseline.
Abstain 48 hours, avoid cycling for 48 hours, and draw PSA BEFORE any examination, not after.
Ejaculation raises PSA for up to 48 hours; a long bike ride and a digital rectal exam do the same. These are common causes of an alarming result.
Abstain 48 hours, no cycling for 48 hours, and draw before any examination.
Roughly halve PSA. A PSA of 1.5 on finasteride corresponds to about 3.0 untreated, and failing to double it has caused missed cancers.
Double your PSA if you have been on a 5-alpha-reductase inhibitor for over six months, and tell whoever reads it.
Prostatitis and urinary infection can raise PSA dramatically — several times baseline — and it stays elevated for weeks after symptoms settle.
Wait 6–8 weeks after any urinary infection before retesting, and never act on a PSA drawn during one.
What PSA (Total + Free + % Free) means in combination
One marker tells you a little; combinations tell you the story. These are the named patterns this one takes part in.
Both effects are the drug working. The one that matters clinically is PSA: these drugs roughly halve it, so a PSA of 1.5 on finasteride corresponds to about 3.0 untreated. Failing to double the value has caused missed cancers.
Double your PSA if you have been on a 5-ARI for more than six months, and tell whoever reads it. Track the trend rather than the absolute.
A single raised PSA causes more panic than almost any other number, and most of the common causes are benign and several are temporary. Ejaculation within 48 hours, a long bike ride, prostatitis, a recent catheter or digital examination, and simple benign enlargement all raise it. So does age, steadily. The free fraction is the number that adds information, and it is the one people skip. PSA circulates bound and unbound; a HIGHER percentage free points toward benign enlargement, a LOWER percentage is the one that raises concern. Measuring total PSA without the free fraction throws away the part that discriminates. The opposite trap also exists: finasteride and dutasteride roughly halve PSA, so a 'normal' reading on a 5-alpha-reductase inhibitor may not be normal at all.
Before anything else, repeat it under clean conditions — no ejaculation, cycling or heavy lifting for 48 hours beforehand. A meaningful share of raised readings resolve on the repeat, and acting on the first one is how people end up in an unnecessary pathway. Ask for the % free PSA on the repeat, not just total. Velocity matters more than any single value — a number rising steadily across draws is more informative than one reading above a threshold, which is the argument for having a baseline before you need one. If you take finasteride or dutasteride, tell whoever reads it, because the correction is not automatic.
Settles it: 🎯 Prostate Health — 7 markers, $234.45 with the discount applied.
What to test next
These put PSA (Total + Free + % Free) in context — each with its own full breakdown.
Frequently asked questions
Total PSA <4.0 ng/mL traditionally; age-specific ranges are more useful. %Free >25% reassuring, <10% concerning. Ranges vary by laboratory and assay — always compare to the range printed on your own report.
Low and — most importantly — stable over time. The velocity of change matters more than any single value.
Requires urological evaluation — but rule out the benign causes above first, since they're far more common.
Reassuring. Note finasteride/dutasteride roughly halve PSA — you must double the reported value to interpret it correctly. This is a consequential and frequently missed detail.
You can order PSA (Total + Free + % Free) directly through Marek Diagnostics without a doctor's visit — drawn at any Quest Diagnostics location in the US. Code CAMERON applies 10% off automatically.
Where this goes next
This page is the free framework. The protocol itself — the dosing, the order to correct things in, the week-by-week schedule and what to retest — is a lesson inside Skool.