Prostate Specific Antigen (PSA)
PSA is a protein made by the prostate, used to help check prostate health. A raised PSA is far more often down to a harmless enlarged prostate, inflammation, or recent activity than to cancer, and it cannot diagnose cancer on its own. Whether to have the test at all, and what a result means for you, are decisions best made together with your GP.
Targeted TestingWhat is prostate specific antigen (psa)?
Prostate specific antigen (PSA) is a protein made by the prostate gland — a small gland below the bladder in people with male reproductive anatomy. Small amounts of PSA leak into the bloodstream, where they can be measured by a blood test. PSA cannot be used by itself to diagnose prostate cancer. Many other conditions — as well as ordinary activities and medicines — can also cause PSA levels to rise, which means a raised PSA is not the same as a diagnosis of cancer. PSA also tends to rise with age, partly because the prostate gland typically enlarges as men get older, and a larger gland will release more PSA into the blood even without any disease.
Why is it tested?
PSA testing is not a routine population screening test in Australia. There is currently no organised, population-based screening programme for prostate cancer in Australia, and the joint position of Cancer Council Australia is that the harm of screening the general population with the PSA test outweighs the benefit. When PSA testing is done, it is as a shared decision between you and your GP — not a blanket recommendation. In fact, GPs are advised not to order a PSA test unless the person provides informed consent for the testing. Your GP may discuss PSA testing with you if you have urinary symptoms, a family history of prostate cancer, or if you ask about it and want to weigh the options together. The test can be useful in certain clinical contexts — for example, monitoring someone already known to have prostate disease — but its limitations are real and worth understanding before deciding.
Reference range (Australia)
PSA rises with age and with benign prostate conditions; a result above the reference interval is more often benign than cancer; routine population screening is not recommended and testing is an informed, shared decision with a GP.
Reference intervals vary between laboratories. Always use the range printed on your own report.
What your result means
A lower PSA is generally reassuring. It is worth knowing PSA is not a perfect marker, so a low result does not completely rule out prostate conditions on its own, which is why your GP reads it alongside your age, any symptoms, and your history. On its own, a low PSA usually needs no specific action.
A PSA within the reference interval on your report is reassuring as far as it goes, but it does not rule prostate disease out on its own. PSA can be normal and a problem still be present. Because PSA is most useful as a trend over time, your GP may discuss whether repeat testing at intervals makes sense for you, depending on your age, risk factors, and personal preferences.
You are probably reading this because your PSA came back above the reference interval, and worrying what it means. Here is the honest answer: when PSA exceeds the reference interval, it is still more likely that the cause is not prostate cancer. The most common reasons are benign hyperplasia (a non-cancerous enlargement of the prostate — very common with age) or prostatitis (inflammation of the prostate, which can be from infection or other causes). Recent activities can also temporarily push PSA up: vigorous exercise, recent ejaculation, anal sex, or a prostate examination can all raise the level for a short period. If any of these apply, your GP may suggest repeating the test after a few weeks without those factors. An above-range result is a reason to talk with your GP — not to panic. They will consider your age, the specific level, your symptoms, your family history, and whether this is a new finding or part of a trend over time.
What can affect your result
PSA is influenced by many things beyond prostate cancer, which is one reason the test has to be interpreted carefully. Age is a consistent driver: the prostate gland typically enlarges with ageing, and a larger gland releases more PSA, so reference intervals are often age-adjusted. Benign prostatic hyperplasia (BPH — non-cancerous prostate enlargement, extremely common in older men) and prostatitis (prostate inflammation) both raise PSA. Temporary factors can also spike the result. PSA levels may temporarily increase after any recent disturbance to the prostate — including vigorous exercise, recent ejaculation, prostate surgery, anal sex, or a prostate examination. If these apply, your GP may recommend waiting a few weeks before retesting. Certain medicines — including some used to treat BPH — can lower PSA, which is worth mentioning to your GP so the result can be interpreted accurately.
When to act
Whether to have a PSA test, and what a result means for you, is a conversation best had with your GP before and after testing — not something to navigate on your own. If your PSA is elevated, your GP will look at the level, your age, your symptoms, and your family history, and advise whether a repeat test, further investigation, or specialist review makes sense for your situation. For many men with a mildly raised PSA, the usual conservative path your GP may take is to monitor and repeat the test rather than move straight to further investigation. PSA trend over time tells your GP more than a single result. This page is general information and is not a substitute for advice from your GP.
Frequently asked questions
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