A friend mentions he "had his prostate blood test" at a check-up, and you start wondering whether you should too. It sounds like a simple yes or no: one blood test, one number. In practice the prostate specific antigen (PSA) test is one of the few blood tests where the decision to have it deserves as much thought as the result. This guide explains prostate health and the PSA test in plain words, what the test can and cannot tell you, and why the UK advises talking it through with a doctor first.
What the prostate is and what it does
The prostate is a small gland, about the size of a walnut, that sits under the bladder and wraps around the tube that carries urine out of the body (the urethra). It makes a thick fluid that mixes with sperm to form semen (NHS, 2024). It tends to grow slowly with age, which is why many men notice changes in the way they pee from their fifties onwards.
Most of those changes come from an enlarged prostate, a very common condition that is not cancer. Prostate cancer is also common: in the UK about 1 in 8 men will get it in their lifetime, and the risk rises with age (Prostate Cancer UK).
Symptoms that are worth a GP appointment
Early prostate cancer often causes no symptoms at all, because it usually starts in the outer part of the gland. When symptoms do appear, the NHS lists:
- difficulty starting to pee, straining or a weak flow;
- "stop start" peeing, or feeling that the bladder has not emptied;
- needing to pee urgently or often, including at night;
- blood in the urine or in the semen;
- problems getting or keeping an erection.
These symptoms do not always mean cancer; an enlarged prostate causes most of them. They still deserve a check, especially if they change or get worse (NHS, 2025). If you suddenly cannot pee at all, or you have severe pain, call 999 or go to A&E. For urgent advice when you are not sure, call NHS 111.
Who is at higher risk
Three things raise the chance of prostate cancer: getting older (it mainly affects men over 50), being Black, and having a family history of prostate cancer, or close relatives with breast, ovarian or pancreatic cancer, which can point to an inherited change in a gene called BRCA2 (NHS, 2025). About 1 in 4 Black men in the UK will get prostate cancer, and Prostate Cancer UK notes that for Black men and men with a family history the higher risk starts from around 45.
What the PSA test measures, and its limits
PSA is a protein made by the prostate. A small amount reaches the blood, and the test measures how much. A raised level can come from prostate cancer, but also from an enlarged prostate, an infection or inflammation of the prostate, recent ejaculation or vigorous exercise. A high PSA does not mean you have cancer (NHS, 2024).
The test has real limits, and they are the reason the UK does not test every man:
- A raised PSA without cancer. Many men with a raised level do not have prostate cancer, yet may go on to further tests that carry their own worry and side effects.
- A normal PSA with cancer. The test can miss cancer. One large study found that about 1 in 7 men with a normal PSA may still have prostate cancer (Prostate Cancer UK).
- Finding cancers that would never cause harm. Some prostate cancers grow so slowly that they would never cause symptoms or shorten life. Finding them can lead to treatment a man did not need, with possible side effects on bladder control and erections.
A large review of the randomised trials, covering more than 700,000 men, found that PSA screening at best leads to a small fall in deaths from prostate cancer over 10 years and makes no difference to deaths overall, while adding harms from biopsies and treatment (Ilic et al., 2018). A UK trial that followed men for 15 years found that deaths from prostate cancer were low whichever way their localised cancer was managed, so the choice of treatment means weighing benefits against side effects (Hamdy et al., 2023).
The UK position on PSA testing
There is no national prostate screening programme for all men. In March 2026 the UK National Screening Committee confirmed that it does not recommend population screening, because in the whole population it is likely to cause more harm than good. It recommended a targeted programme of PSA testing every 2 years for men aged 45 to 61 who carry a harmful BRCA2 variant and have a relevant family history, and said that for Black men there is still uncertainty about whether screening would do more good than harm, with research ongoing (UK National Screening Committee, 2026).
What this means for you today: routine PSA testing is not offered on the NHS, but any man, or anyone with a prostate, can ask a GP about it. Your GP will go through the benefits and risks with you before you decide together whether the test is right for you (NHS, 2024). You do not need a referral to have the test: anyone can order it with us, as the total PSA test on its own, with free PSA, or in the prostate profile. Talking it through with a doctor first is still worthwhile, to understand what the result can and cannot tell you. It is guidance, not a requirement. Prostate Cancer UK suggests that men over 50, and men over 45 with a higher risk, may want to have that conversation.
What happens after a raised PSA
A single raised result is the start of a conversation, not a conclusion. The NHS describes the usual steps:
- A repeat PSA test to see whether the level is still raised.
- Referral to a specialist if it stays high, often with an MRI scan of the prostate first. The scan gives a clearer picture and helps decide whether any further test is needed.
- A biopsy, only if the specialist needs more information.
Every step is decided by your GP or the specialist team who know your history. We never interpret a PSA result for you; take it to a doctor you trust, such as your GP.
