Not necessarily. PSA is a protein made by both healthy and cancerous prostate cells; harmless enlargement of the prostate and prostate inflammation or infection also raise PSA [1]. Only about a quarter of men who have a biopsy because of a high PSA have prostate cancer [1]. The doctor usually repeats the test first and, if needed, asks for a prostate MRI before a biopsy [1, 4].
Key points
- A PSA above 4 is usually considered abnormal, but there is no firm cut-off between normal and abnormal [1].
- With each test, about 6 to 7 per cent of men get a "false positive" result (high without cancer) [1].
- A low PSA does not completely rule out cancer either: in a large study, a biopsy showed cancer in about 1 in 7 men whose PSA had never been above 4 [2].
Factors that affect the PSA level
| Factor | Effect on PSA | Explanation |
|---|---|---|
| Prostate cancer | Raises it | One of the causes, not the only one [1] |
| Harmless enlargement of the prostate | Raises it | One of the most common non-cancer causes [1] |
| Prostate inflammation or infection | Raises it temporarily | May last a month or two [1] |
| Recent prostate biopsy | Raises it temporarily | May last a month or two [1] |
| Heavy exercise (such as cycling) and ejaculation | Raises it slightly and briefly | [1] |
| The medicines finasteride and dutasteride | Lowers it | A lower cut-off is used for these men [1] |
Before the test, tell your doctor about your medicines, any recent infection and recent activities.
Next steps after a high PSA
- 1
Repeat PSA and examination
A repeat test to confirm; sometimes follow-up with several PSA tests and examinations [1].
- 2
Prostate MRI
In one study, doing an MRI before biopsy found more significant cancers, and about 1 in 4 men did not need a biopsy because their MRI was normal [3].
- 3
Deciding about a biopsy
If the MRI shows a suspicious area, a sample is taken from that area; if the MRI is normal and suspicion is low, PSA is sometimes followed instead of doing a biopsy [4].
When should I call my doctor?
Review the result with your doctor; usually the PSA test is repeated after 6 to 8 weeks to confirm it [1]. Tell your doctor about your medicines, any recent urine infection and activities such as cycling or ejaculation in the days before the test [1].
Fever and chills with burning or pain when passing urine, or being unable to pass urine, need urgent medical attention.
Related questions
Is a PSA test recommended for everyone?
The US Preventive Services Task Force considers the decision personal for men aged 55 to 69 (after discussing benefits and harms) and does not recommend it for men aged 70 and over [5]. In a European study with 23 years of follow-up, PSA testing slightly reduced deaths from prostate cancer; several hundred men had to be invited to testing to save one life [6]. On the other hand, testing sometimes finds cancers that would never have caused harm [5].
My PSA has risen after treatment for prostate cancer; what does this mean?
After surgery or radiotherapy, PSA is used for follow-up, and a rise may be the first sign that the cancer has come back [1]. Contact your treatment team. Read more: Prostate cancer
Related cancer types
Related questions
References
6 referencesShow all references, 5 with a study cardClose the reference list
Numbers in the text, such as [1], refer to these sources. Sources with a “Study card” button are summarised in the site’s evidence library.
- 1
- 2Prevalence of Prostate Cancer among Men with a Prostate-Specific Antigen Level ≤4.0 ng per Milliliter
- 3MRI-Targeted or Standard Biopsy for Prostate-Cancer Diagnosis
- 4EAU-EANM-ESTRO-ESUR-ISUP-SIOG Guidelines on Prostate Cancer—2026 Update. Part I: Screening, Diagnosis, and Local Treatment with Curative Intent
- 5Screening for Prostate Cancer: US Preventive Services Task Force Recommendation Statement
- 6European Study of Prostate Cancer Screening — 23-Year Follow-up
This page is based on reputable scientific sources and was last updated on 28 October 2026. The content of this website is for educational and informational purposes only and does not replace consultation, diagnosis or treatment by a specialist physician. Consult your treating physician about any treatment decision.
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