Raised PSA

Understanding an elevated PSA result and what it means for you

What is PSA and why is it measured?

PSA (prostate-specific antigen) is a protein produced by cells of the prostate gland. Small amounts enter the bloodstream, where they can be measured with a simple blood test. PSA is not a cancer marker — it is a prostate marker. It rises whenever the prostate gland is inflamed, enlarged, or disturbed, regardless of the cause.

PSA testing is used to identify men who may benefit from further investigation for prostate cancer, because many early prostate cancers do not cause symptoms. However, an elevated PSA requires careful interpretation rather than an automatic response.

What can cause a raised PSA?

The most common reasons for an elevated PSA include:

Benign prostatic hyperplasia (BPH) — a non-cancerous enlargement of the prostate; a larger prostate produces more PSA
Prostatitis — inflammation or infection of the prostate, which can acutely raise PSA by a significant amount
Urinary tract infection — may temporarily elevate PSA
Recent ejaculation or vigorous physical activity — can cause a short-lived rise
Prostate cancer — particularly clinically significant cancer, which typically produces a disproportionate PSA rise relative to prostate size

Understanding the likely cause guides the appropriate response.

What happens next

Confirming the result

A single raised PSA result is usually repeated after a few weeks, avoiding any factors that may have temporarily elevated the level. If the result remains elevated, further investigation is recommended.

Multiparametric MRI (mpMRI)

An MRI of the prostate is now recommended before proceeding to biopsy. The scan assesses the internal architecture of the prostate and assigns a PIRADS score (1–5) to any suspicious areas. This information helps determine whether a biopsy is warranted and, if so, which areas should be sampled.

Prostate biopsy

A biopsy is recommended when the MRI shows a suspicious lesion (PIRADS 3, 4, or 5) and the PSA level or other features support sufficient clinical concern. The preferred method is a transperineal biopsy under anaesthesia, which combines systematic sampling with targeted sampling of MRI-suspicious areas.

Watchful waiting

If the MRI is reassuring (PIRADS 1 or 2) and the PSA is only mildly elevated, active surveillance with regular PSA checks and repeat MRI is often the most appropriate approach.

Making sense of your result

A raised PSA result can be unsettling, but the majority of men investigated for raised PSA do not have prostate cancer. The investigation pathway is designed to identify those who do have a clinically significant cancer — one that requires treatment — while avoiding unnecessary procedures in those who do not.

Following a structured evaluation — repeat PSA, mpMRI, and biopsy where indicated — gives a reliable picture of whether prostate cancer is present, and if so, its nature and likely behaviour. This information is the basis for all subsequent decisions, whether that involves active surveillance, treatment, or simply reassurance and monitoring.

Frequently Asked Questions

: Not necessarily. PSA can be elevated for several reasons other than cancer, including a benign enlarged prostate (BPH), prostate infection (prostatitis), urinary tract infection, recent sexual activity, or vigorous exercise before the test. A raised PSA is a signal for further investigation — not a diagnosis. Most men with a raised PSA do not have prostate cancer.
: There is no universal cut-off, because the appropriate level depends on age, prostate size, and individual risk factors. As a general guide, a PSA above 3–4 ng/mL in men over 50 is typically flagged for further evaluation. PSA should also be interpreted alongside the rate of change over time (PSA velocity) and the ratio of free to total PSA.
: The next step is usually a repeat PSA test to confirm the result, followed by a multiparametric MRI (mpMRI) of the prostate. This MRI helps assess whether any suspicious areas are present and guides decisions about biopsy. Not every man with a raised PSA will need a biopsy.
: PSA density divides the PSA level by the prostate volume measured on MRI or ultrasound. A higher PSA density — meaning a high PSA relative to prostate size — is more concerning for cancer than a high PSA explained simply by a large prostate. PSA density helps refine the risk assessment.
: Yes. Prostatitis (prostate inflammation or infection) is a common cause of acutely or chronically elevated PSA. A urinary tract infection can also temporarily raise PSA. If infection or inflammation is suspected, antibiotics and a repeat PSA test several weeks later are usually recommended before proceeding to imaging.

Need an assessment?

To arrange an appointment or discuss your situation, please contact the secretary.