In short
PSA is made by the prostate, not by cancer alone. An enlarged prostate, an infection, a recent biopsy, cycling and even ejaculation all raise it — which is why one number above the cutoff is a reason to repeat, not to panic.
Emergency if: Being completely unable to pass urine with a painfully full bladder — this needs emergency treatment to drain the bladder.
On your report
PSA (Prostate-Specific Antigen), Creatinine, ALP, Testosterone, Total +1 more
On this page
01
What PSA actually measures
Prostate-specific antigen is a protein made by prostate tissue and released into semen, with a small amount reaching the blood. It is specific to the prostate, but it is not specific to cancer — any process that enlarges, inflames or disturbs the gland pushes more of it into the bloodstream. That single distinction explains almost everything confusing about the test.
A PSA level above 4.0 ng/mL is considered abnormal and may lead to a recommendation for prostate biopsy. In practice the cutoff is adjusted: a higher threshold such as 5 ng/mL may be used for older men, and a lower one such as 2.5 ng/mL for younger men, because the prostate grows with age and carries a higher baseline.
02
The non-cancer reasons a PSA is high
Benign prostatic hyperplasia — ordinary age-related enlargement — and prostatitis both raise PSA, and between them they account for a large share of raised results. An infection or inflammation of the prostate, or a recent prostate biopsy, can keep PSA raised for a month or two afterwards, so a test taken soon after any of these is difficult to interpret.
Shorter-lived effects matter too. Vigorous exercise such as cycling, and ejaculation, can raise PSA transiently. Avoiding both for a couple of days before the blood draw removes a genuine source of false alarm, and a raised result is very often simply repeated after an interval before anything further is arranged.
03
What the numbers do and do not tell you
About 6% to 7% of men have a false-positive PSA test on any given screening round, and only about 25% of men who have a biopsy because of a raised PSA are found to have prostate cancer. Read in the other direction, that means three out of four biopsies prompted by a raised PSA do not find cancer — and that PSA is a trigger for further thought rather than an answer.
The trend over time carries more information than any single value. A PSA that is drifting steadily upward across several tests is treated differently from one that spiked once and settled. Some reports also print free PSA alongside total PSA. A lower proportion of free PSA is associated with a higher chance that a raised total reflects cancer rather than benign enlargement, and the ratio is used to refine borderline cases rather than to decide them.
04
Screening is a decision, not a default
The benefit of PSA screening is real but modest: over roughly 13 years of follow-up, about 1.3 deaths from prostate cancer are avoided per 1,000 men screened. Set against that are overdiagnosis and overtreatment — finding slow-growing disease that would never have caused symptoms, and treating it with procedures that carry urinary and sexual side effects.
That balance is why most guidance frames PSA testing as a shared decision rather than a routine tick-box, usually discussed from around age 50, and earlier for men with a family history or other higher-risk factors. Knowing in advance what you would do with an abnormal result is part of deciding whether to have the test.
05
What happens after a raised result
The usual sequence is a repeat PSA after several weeks, having avoided cycling and ejaculation beforehand and having treated any urinary infection. If it stays raised, an MRI of the prostate is now commonly done before any biopsy, because it can identify which areas need sampling and can spare some men a biopsy altogether.
Symptoms are assessed alongside the number, though they are less discriminating than people assume — a weak stream, getting up at night and urgency are far more often from benign enlargement than from cancer. Symptoms that do warrant prompt attention are blood in the urine or semen, bone pain, and being unable to pass urine at all.
When to act
Routine — see a doctor
A mildly raised PSA with no symptoms: repeat after several weeks, avoiding cycling and ejaculation for two days before the sample.
Same-day — call promptly
Fever with pain on passing urine and a raised PSA, which suggests prostate infection needing treatment before the test is repeated.
Emergency — act now
Being completely unable to pass urine with a painfully full bladder — this needs emergency treatment to drain the bladder.
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