A PSA test measures a prostate protein in your blood, with a result in nanograms per millilitre. In many men under 50 that value sits around or below 1 ng/ml. A raised PSA value rarely means cancer, because benign causes lift the protein just as well. This page explains how the PSA test works, when it makes sense, and how to read the result in context.
Our view first. The PSA test is not a package deal for every man, but it is a worthwhile topic to discuss with your GP.
What is a PSA test?
A PSA test is a blood test that measures prostate-specific antigen, a protein your prostate makes. It normally sits in small amounts in your blood. The value rises when something is going on in your prostate, but the test does not say what that something is.
PSA is prostate-specific, not a cancer test.
The key thing to remember: a high number points to activity in your prostate, nothing more. Inflammation, an enlarged prostate and cancer can all produce the same figure. So a result is a starting point for a conversation, not a conclusion. To understand the protein behind it, read the explainer on our PSA marker page.
The prostate is a small gland below your bladder that makes fluid for semen. A small share of the PSA it produces leaks into your blood, and that is what the test measures. With a larger or irritated prostate, more leaks out, so your value rises. That explains why age and benign conditions can push the figure up without any cancer involved.
How does a PSA test work?
A PSA test works through an ordinary blood draw from your arm, usually a few millilitres. The lab measures how much prostate-specific antigen is in each millilitre of blood. You get back a number in ng/ml, which your doctor reads against your age and history.
The steps in order:
- Draw: a venous sample, like any other blood test. Fasting is not needed.
- Analysis: the lab determines the PSA concentration with a validated immunoassay.
- Result: a value in ng/ml, often with an age-based reference range.
- Context: your doctor weighs the value against your age, symptoms and any earlier measurement.
A single number without context says little. A trend across several measurements says more than one snapshot, because PSA naturally fluctuates. How a normal PSA value differs by age, you can read in our article on PSA levels by age.
When should you get a PSA test?
You mainly get a PSA test after talking with your GP, not as a routine annual check. The Health Council advises against population-wide routine PSA screening, because the downsides outweigh the gains for many men (Gezondheidsraad, 2021). A test makes more sense with symptoms or a raised risk.
Who might consider a PSA test?
- Men with urinary symptoms: a weak stream, frequent urge, dribbling or a sense of incomplete emptying.
- Men with prostate cancer in the family: especially a father or brother diagnosed at a younger age.
- Men who want to test themselves: after weighing the pros and cons together with their doctor.
With urinary symptoms, your GP looks wider than PSA alone. The Dutch GP guideline on male urinary symptoms recommends weighing symptoms and a physical exam first, and using PSA only when the result genuinely changes the plan (NHG, 2014). Requesting PSA only helps if you know in advance what you will do with the result.
A concrete example. A 55-year-old whose father had prostate cancer at 60 discusses his risk with the GP and, together, they choose a first measurement as a reference point.
The downside of testing is real. A raised result often leads to follow-up such as an MRI or a biopsy, which can bring discomfort and worry, while not every finding would ever cause symptoms. That balance between possible gain and possible harm is exactly why the choice to test is a personal one, made together with your doctor.
What can temporarily affect your PSA value?
Your PSA value can rise temporarily through everyday things that have nothing to do with cancer. That is exactly why a one-off increase is rarely cause for immediate alarm. A second measurement a few weeks later gives a more reliable picture.
Many men fluctuate without anything serious going on.
These factors can temporarily raise your PSA:
- Recent ejaculation: abstain for 48 hours before the draw, because ejaculation can briefly raise PSA (Herschman et al., 1997).
- Intense cycling: prolonged saddle pressure just before the test can nudge the value up.
- A urinary tract infection or prostate inflammation (prostatitis): inflammation often raises PSA sharply and temporarily.
- A recent prostate exam: a digital rectal exam (DRE) or catheter shortly before the draw can affect the value.
- Age and an enlarged prostate: PSA rises gradually with the years and with a benign enlarged prostate.
The practical lesson is simple. Schedule your draw on a quiet day, avoid ejaculation and intense cycling in the 48 hours before, and postpone the test during an active infection. That way you avoid a falsely raised result that causes needless worry.
PSA test at the GP or through a blood test at home?
Both routes measure the same protein, but suit different situations. With symptoms or a family risk, the GP should be the starting point. If you want a proactive reference value, a PSA test at home through a blood test can be a low-barrier first step, provided you discuss the result with a doctor.
The trade-off between the two routes:
| Route | When it makes sense | What you get | Point to note |
|---|---|---|---|
| Through the GP | With urinary symptoms, a family risk or doubt about testing | A conversation first, a physical exam and direct interpretation | An appointment is needed; PSA is not always requested by default |
| Through a blood test at CaliberHealth | When you want a proactive reference value without symptoms | A validated lab value, reviewed by a BIG-registered doctor | A result is not a diagnosis; always discuss a rise with your GP |
Our honest caveat. A home blood test does not replace the GP conversation, and is no reason to screen yearly without a clear reason. It is a tool to go into the conversation well informed.
If you want a focused measurement with interpretation, see the Prostate Health Check, where a doctor reviews your result.
Frequently asked questions
Does a high PSA value mean I have cancer?
No, a high PSA value does not automatically mean cancer. An enlarged prostate, an inflammation or recent activity can raise the value just as well. False-positive results are common. So a rise is usually followed by a second measurement and a talk with your doctor, not an immediate diagnosis.
Do I need to prepare for a PSA test?
You do not need to fast, but a few things help. Abstain from ejaculation for 48 hours, avoid intense cycling shortly before the draw, and postpone the test during an active urinary infection. If you have just had a rectal exam, wait a while. This lowers the chance of a temporarily raised value.
How often should I get a PSA test?
There is no fixed rule, and we do not give one. The right frequency depends on your age, your risk and your earlier values, and that is something you discuss with your GP. For most men without symptoms or risk, routine repeating is not useful according to the Health Council.
Getting started
The concrete first step is a conversation, not a number. If you have urinary symptoms or prostate cancer in the family, make an appointment with your GP to discuss whether a PSA test fits you. To read more broadly, the full picture is in our guide on prostate health, screening and prevention.
References
- Herschman JD, Smith DS, Catalona WJ. Effect of ejaculation on serum total and free prostate-specific antigen concentrations. Urology. 1997;50(2):239-243. PMID: 9255295.
- Gezondheidsraad. Vroege opsporing van prostaatkanker. The Hague: Health Council of the Netherlands. 2021.
- Dutch College of General Practitioners (NHG). NHG Guideline on Urinary Symptoms in Men. 2014.
- European Association of Urology. EAU Guidelines on Prostate Cancer. 2024.
Disclaimer
Caliberhealth works with BIG-registered doctors who review your blood results. This article provides general information and is not a substitute for medical advice from a GP or specialist. A blood test is a tool to inform your conversation with your doctor, not a diagnosis on its own. For severe symptoms or concerns about your health: contact your GP, or call 112 in an emergency.
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