A PSA blood test is one of the most common pathology requests a GP makes for male patients — and one of the most frequently misunderstood. The result is not a diagnosis. The preparation is simpler than most men expect. And whether to test at all is a more considered decision than it might first appear.
Shire Family Medical in Sutherland sees men at various stages of this conversation — some wondering whether they should have the test, some who’ve received a result and aren’t sure what it means, and some who simply want to know whether they need to skip breakfast first. The short answer to that last question: no, fasting is not required.
This article covers what PSA actually measures, the types of PSA tests available in Australia, how to prepare for the blood draw, what else can affect your result, and what the current Australian guidelines say about when and whether men should consider testing.
What a PSA Blood Test Measures
A PSA blood test measures the concentration of prostate-specific antigen — a protein produced naturally by the prostate gland — in a man’s bloodstream. Elevated PSA can indicate prostate cancer, but it can also be caused by a number of other conditions that have nothing to do with cancer, which is why the result on its own is never a definitive diagnosis of anything.
Common non-cancerous causes of elevated PSA include:
- Benign prostatic hyperplasia (BPH) — a non-cancerous prostate enlargement that is common in men over 50
- Prostatitis — inflammation or infection of the prostate gland
- Recent sexual activity or ejaculation
- Vigorous exercise, particularly cycling or horse riding
- A urinary tract infection
- Recent prostate examination, catheterisation, or surgical procedure
A PSA blood test is a starting point for a clinical conversation, not the end of one. Your GP interprets the result alongside your age, symptoms, family history, medication use, and other risk factors — the number alone rarely tells the whole story.
Types of PSA Tests Available in Australia
There are three types of PSA tests available in Australia, each measuring different forms of prostate-specific antigen in the blood. Most men will only ever need the first.
The Total PSA test is the most widely used and is what most GPs mean when they order a PSA test. It measures all forms of PSA in the blood — both free (unbound) and protein-bound — and the result is assessed against age-related reference ranges to determine whether further investigation may be appropriate.
The Free to Total PSA ratio may be used if Total PSA levels are persistently elevated. PSA associated with prostate cancer tends to bind to proteins in the blood, which reduces the proportion of free PSA. A lower free-to-total ratio can suggest a higher likelihood of cancer rather than a benign cause such as BPH, and may help guide decisions about further investigation without immediately proceeding to a biopsy.
The Prostate Health Index (PHI) is a newer test that measures three forms of PSA — total PSA, free PSA, and an isoform called [-2]proPSA — and combines them into a single score. PHI can be more specific for detecting clinically significant prostate cancer than Total PSA alone. Your GP will determine which test is appropriate based on your PSA history, age, and individual clinical picture.
Do You Need to Fast Before a PSA Blood Test?
No — fasting is not required before a PSA blood test. Unlike a cholesterol or fasting glucose test, PSA levels are not affected by food or drink. You can eat and drink normally in the hours before having your blood drawn.
What your GP may ask you to avoid in the 48 hours before the test:
- Sexual activity or ejaculation — this can temporarily elevate PSA levels and make results harder to interpret
- Vigorous exercise, particularly cycling or horse riding — sustained pressure on the perineal area can transiently raise PSA
- Active urinary tract infection symptoms — if you have a UTI, speak with your GP about whether to delay the test, as active infection can significantly inflate the result
Your GP or the pathology team will confirm the specific instructions relevant to your situation. If you’re unsure what to do ahead of the appointment, a quick call to the clinic is always the right move.
What Else Can Affect Your PSA Result
Several factors beyond food, drink, and exercise can influence PSA levels, and your GP needs your complete medication and health history before interpreting any result.
5-alpha reductase inhibitors — a class of medication used to treat benign prostatic hyperplasia — can lower PSA levels substantially, sometimes by half or more. This directly affects how a result is read. If you take this type of medication, your GP will factor it in before drawing any conclusions.
Age matters independently. PSA levels tend to rise naturally as men get older, which is why what counts as a clinically significant reading varies by age, individual baseline, and the rate of change across multiple readings over time — not just a single number at a single point.
Long-term aspirin use, certain statins, and some anti-inflammatory drugs may have modest effects on PSA levels. Always tell your GP and the pathology team about any medications, supplements, vitamins, or recent procedures before a PSA test is requested — this isn’t just a formality; it changes how your result is interpreted.
What Australian Guidelines Say About PSA Testing
Current Australian clinical guidelines recommend that men discuss the potential benefits and harms of PSA testing with their GP before deciding whether to test, rather than undergoing routine screening without that conversation.
For men at average risk of prostate cancer, the guidelines support offering PSA testing every two years between the ages of 50 and 69 — for those who choose to test after an informed discussion with their doctor. For men with a family history of prostate cancer, earlier testing is recommended: current guidance suggests discussing PSA testing from age 40 to 45, with the exact starting age depending on the specifics of that family history.
For men aged 70 and older, the guidelines note that the potential harms of PSA testing may outweigh the benefits — largely because of the risk of detecting slow-growing cancers that may never have caused harm during a man’s lifetime, and the risks associated with treatment for those cancers.
PSA testing is not part of a national cancer screening programme in Australia, unlike bowel cancer screening through the National Bowel Cancer Screening Program. There is no government-issued reminder or test kit. The decision to test, and when, is made in consultation with a GP based on your individual risk profile, any symptoms you’re experiencing, and what you would want to do with the information a result might generate.
What Happens After a PSA Blood Test
A PSA result on its own doesn’t diagnose or rule out prostate cancer — it’s a piece of information that shapes the next clinical conversation.
If your result sits within a range considered unremarkable for your age and risk profile, your GP will discuss what that means going forward — whether to retest at some point and what would prompt a review sooner.
If your result is elevated, the most important thing to know is that this doesn’t mean cancer. Your GP will consider the full picture: your age, any symptoms, whether you followed the preparation instructions, your medication list, the rate of change from any previous results, and your overall health. Next steps may include repeating the test after a short interval, arranging a prostate MRI, or referring you to a urologist for specialist assessment. An elevated PSA result is the beginning of an investigation, not a conclusion.
A GP-led approach means you’re not navigating the result alone — any next step is explained in terms of what it would actually tell you and what your options are. If a broader health review is overdue, a men’s health GP appointment covers several areas at once and gives your GP the context to put any PSA discussion in perspective.
Arranging a PSA Blood Test in Sutherland
A PSA blood test is a straightforward blood draw — quick, low-risk, and processed through pathology. The more considered question is whether it’s the right test for you at this point, and what you’d want to do with the result.
For men across the Sutherland Shire, a GP appointment is the right starting point — both to discuss whether testing makes sense and, if so, to arrange the pathology request. On-site pathology collection at Shire Family Medical, 154 Flora Street Sutherland — an AGPAL-accredited general practice — means that if blood tests are requested, samples can be collected at the practice without a separate trip to an external collection centre. Pathology collection is available Monday to Friday, 8:30 am to 11:30 am.
Book a men’s health appointment at Shire Family Medical →
Frequently Asked Questions
Do you need to fast before a PSA blood test?
No. PSA levels are not affected by food or drink, so fasting is not required before a PSA blood test. You can eat and drink normally beforehand. However, your GP may ask you to avoid ejaculation and vigorous exercise — particularly cycling — for 48 hours before the test, as both can temporarily elevate PSA levels and affect how the result is interpreted.
What is a PSA blood test and what does it measure?
A PSA blood test measures the level of prostate-specific antigen — a protein produced by the prostate gland — in the bloodstream. Elevated PSA can be caused by prostate cancer, but also by benign prostatic hyperplasia (BPH), prostatitis, recent ejaculation, vigorous exercise, or urinary tract infection. A PSA result must be interpreted by a GP alongside age, symptoms, medications, and prior test results — it is not a standalone diagnosis.
What should you avoid before a PSA blood test?
In the 48 hours before a PSA blood test, avoid ejaculation and vigorous exercise, particularly cycling or horse riding. If you have symptoms of a urinary tract infection, speak with your GP about whether to delay the test, as active infection can significantly elevate PSA levels. Fasting is not required — food and drink do not affect PSA levels.
What are the types of PSA tests available in Australia?
There are three PSA tests available in Australia: the Total PSA test (the standard first test, measuring all PSA in the blood), the Free to Total PSA ratio (used when Total PSA is persistently elevated, to help distinguish cancer from benign causes such as BPH), and the Prostate Health Index (PHI), a newer test measuring three forms of PSA that can be more specific for detecting clinically significant prostate cancer. Your GP will determine which test is appropriate based on your clinical history and prior results.
Can medications affect a PSA result?
Yes. Medications used to treat benign prostatic hyperplasia (BPH) — known as 5-alpha reductase inhibitors — can lower PSA levels substantially, sometimes halving them, which directly affects how a result is interpreted. Long-term aspirin use and some anti-inflammatory drugs may also have modest effects. Always inform your GP and the pathology team about any medications, supplements, vitamins, or recent procedures before a PSA test is requested, as this changes how your result is interpreted.
How often should men have a PSA test?
Current Australian clinical guidelines recommend that men at average risk of prostate cancer who choose to test be offered a PSA test every two years between the ages of 50 and 69. Men with a family history of prostate cancer are advised to discuss testing from age 40 to 45, depending on their specific family history. PSA testing is not part of a national screening programme — the decision about whether and when to test is made through an informed conversation with a GP.
What does a high PSA result mean?
An elevated PSA result does not diagnose prostate cancer. It means the level is higher than expected for a man’s age and circumstances, which warrants further clinical attention. A GP will consider the full picture — including medications, test preparation, symptoms, and prior results — before recommending any next step. These may include repeating the test, arranging a prostate MRI, or referral to a urologist. An elevated result is the beginning of an investigation, not a conclusion.
This article provides general health information only. It is not a substitute for personalised medical advice and does not create a doctor-patient relationship. Any treatment, test, procedure or vaccination mentioned is for illustrative purposes only — suitability depends on individual circumstances and assessment by a qualified health professional. Medical information can change; always speak with your GP about your specific symptoms, health history and care options. In an emergency, call 000.
