PSA Testing in New Zealand: The Pros, the Cons, and What I Tell My Patients
PSA testing is one of those topics that comes up all the time in general practice, and it’s also one of the most misunderstood.
Some people think it’s a simple “yes or no” cancer test.
Others have heard it’s useless or even dangerous.
As with most things in medicine, the truth sits somewhere in the middle.
What Is a PSA Test?
PSA stands for Prostate Specific Antigen. It’s a protein made by the prostate, and it’s measured with a simple blood test.
Higher PSA levels can be associated with prostate cancer, but they can also be caused by many non-cancerous things, such as:
- Benign prostate enlargement (very common as men age)
- Prostatitis or infection
- Recent ejaculation
- Cycling
- Even recent prostate examination
So a raised PSA does not automatically mean cancer.
The Pros of PSA Testing
There are genuine benefits to PSA testing, which is why it hasn’t been abandoned.
1. It can detect prostate cancer early
PSA testing can pick up prostate cancer before symptoms appear. In some cases, this can be life-saving, especially for more aggressive cancers.
2. It’s simple and accessible
It’s just a blood test. No scans. No procedures. No hospital visits.
3. It’s useful for higher-risk groups
Men with a strong family history of prostate cancer, or those of Māori or Pacific ethnicity, may be at higher risk and benefit more from testing.
4. It gives information
A normal PSA can be reassuring. A rising PSA over time can prompt closer monitoring or referral when appropriate.
The Cons (and Why It’s Controversial)
This is where things get tricky.
1. PSA is not cancer-specific
Many men with an elevated PSA do not have prostate cancer, which can lead to anxiety and further testing that turns out to be unnecessary.
2. Overdiagnosis is real
Some prostate cancers are slow-growing and would never cause harm during a man’s lifetime. PSA testing can detect these cancers, leading to treatment that may not have been needed.
3. Treatment has side effects
Treatment for prostate cancer can involve surgery or radiotherapy, which may cause:
- Urinary incontinence
- Erectile dysfunction
- Bowel issues
These risks are not trivial and must be weighed carefully.
4. A normal PSA doesn’t rule cancer out completely
Some prostate cancers don’t produce much PSA at all.
So What’s Recommended in New Zealand?
In New Zealand, PSA testing is not part of a population-wide screening programme.
Instead, the recommendation is informed decision-making.
This means:
- Men should not be automatically tested
- Men should be given balanced information about the pros and cons
- The decision to test should be made together with a healthcare professional
In practice, many GPs will discuss PSA testing with men from around age 50, or earlier (around 40–45) if they are at higher risk.
My Personal View as a GP
I don’t believe PSA testing is “good” or “bad”.
I believe it’s context dependent.
For some men, it’s entirely reasonable to have a PSA test.
For others, it may cause more harm than benefit.
What matters is:
- Understanding what the test can and cannot tell you
- Being prepared for what might come next if it’s abnormal
- Not doing it “just because”, but also not avoiding it out of fear
Where At-Home PSA Testing Fits In
At-home PSA testing isn’t about bypassing doctors or making diagnoses.
For some men, it removes the biggest barrier: taking the first step.
It can:
- Prompt an earlier conversation with a GP
- Encourage men who would otherwise avoid testing
- Provide a baseline result to discuss with a healthcare professional
Any abnormal result should always be followed up with a doctor.
The Bottom Line
PSA testing isn’t perfect.
But doing nothing isn’t perfect either.
If you’re considering a PSA test, the most important thing is to be informed, not frightened and to understand that the test is just the beginning of a conversation, not the final answer.
If reading this has made you think, “Maybe I should look into this”, that’s exactly the point.
Medical Disclaimer
The information provided in this article is for general educational purposes only and is not intended to replace personalised medical advice. PSA testing has benefits and limitations, and whether it is appropriate for you depends on your individual risk factors, medical history, and personal preferences.
If you are considering PSA testing, or if you have symptoms or concerns about prostate health, you should discuss this with your general practitioner or another qualified healthcare professional. Any abnormal test result should always be followed up with appropriate medical advice and investigation.
