Understand your PSA blood test result. Assess urinary symptoms, estimate PSA density and velocity, and learn about common causes of PSA elevation.
PSA is not a cancer diagnosis test.
PSA may increase due to:
Some prostate cancers occur despite lower PSA levels.
Educational information about PSA testing, interpretation and related concepts.
PSA (Prostate-Specific Antigen) is a protein produced by cells of the prostate gland. A small amount normally circulates in the bloodstream and can be measured by a routine blood test. PSA testing is used to monitor prostate health and may form part of prostate cancer screening programmes in some countries. It is important to understand that PSA is not specific to prostate cancer — many non-cancerous conditions can raise PSA levels.
PSA levels naturally tend to increase with age, partly due to the normal growth of the prostate gland over time. A PSA value that might raise concern in a 45-year-old man could be within the expected range for a 70-year-old. For this reason, age is always considered alongside the actual PSA value when interpreting results. Some guidelines recommend age-specific PSA reference ranges, though practices vary between countries and clinical settings.
PSA density (PSAD) is calculated by dividing the PSA value by the prostate volume (measured on ultrasound or MRI). It is used to determine whether the PSA level is proportionate to the size of the prostate. A larger prostate naturally produces more PSA. A higher PSA density suggests that PSA may be elevated beyond what can be explained by prostate size alone, which may prompt further clinical evaluation. A PSAD above 0.15 ng/mL/cc is generally considered elevated in most clinical guidelines.
PSA velocity refers to how quickly PSA is rising over time, expressed as ng/mL per year. It requires at least two PSA measurements taken at known time intervals. A rate of increase greater than 0.75 ng/mL per year has been associated with a higher likelihood of clinically significant disease in some studies, but it should not be used as a standalone indicator. PSA velocity is most useful when interpreted alongside absolute PSA values, age, and other clinical factors.
LUTS include a group of urinary symptoms that are commonly associated with prostate conditions, particularly benign prostatic hyperplasia (BPH). They include nocturia (waking at night to urinate), increased daytime urinary frequency, a weak or slow urine stream, hesitancy (difficulty starting urination), and incomplete bladder emptying. LUTS do not confirm a specific diagnosis — they indicate a need for clinical evaluation. Not all men with an elevated PSA have significant LUTS, and not all men with LUTS have an elevated PSA.
An elevated PSA on a single test does not automatically lead to further invasive investigation. Many doctors will first repeat the test after an appropriate interval to confirm the result, having excluded temporary causes such as infection or recent manipulation. If the elevation persists, further evaluation may include prostate MRI (multi-parametric MRI or mpMRI), which is non-invasive, and prostate biopsy if clinically indicated. The pathway depends on the clinical context, the PSA trend, and shared decision-making between the patient and doctor.
Finasteride (Proscar) and dutasteride (Avodart) are 5-alpha reductase inhibitors used to treat BPH and male-pattern hair loss. These medications reduce PSA levels by approximately 50% after 6–12 months of use. A man taking these medications may therefore have a PSA that appears artificially low. Clinicians typically double the measured PSA value ("adjusted PSA") when interpreting results in men on these medications. Always inform your doctor about all medications you take before a PSA test.
PSA (Prostate-Specific Antigen) is a protein produced by the prostate gland. A small amount circulates in the blood and can be measured by a simple blood test. PSA testing is used to monitor prostate health and screen for conditions affecting the prostate. It is not a cancer-specific test.
There is no single universal 'normal' PSA value. PSA typically increases with age. Levels below 4 ng/mL are within a commonly encountered range for most adult men, but age, symptoms, prostate size and other factors influence interpretation. Always discuss your result with your doctor.
PSA can rise due to benign prostate enlargement (BPH), prostatitis, urinary tract infections, recent ejaculation, prostate examination (DRE), catheterisation, cystoscopy or prostate biopsy. Prostate cancer is one among several possible causes of PSA elevation.
PSA density is calculated by dividing the PSA value by prostate volume (measured on ultrasound or MRI). A higher PSA density may suggest that PSA is elevated beyond what would be expected from prostate size alone. Values above 0.15 ng/mL/cc are generally considered elevated.
PSA velocity is the rate at which PSA increases per year, calculated as (current PSA − previous PSA) ÷ time in years. A rapid increase of more than 0.75 ng/mL per year may warrant further evaluation, but should be interpreted alongside other clinical information.
No. A high PSA does not confirm prostate cancer. Many non-cancer conditions can raise PSA, and some prostate cancers occur despite normal PSA levels. PSA is a screening tool that must be interpreted alongside clinical assessment by a doctor.
LUTS (Lower Urinary Tract Symptoms) include frequent urination, waking at night to urinate, a weak urine stream, hesitancy before flow starts, and a feeling of incomplete bladder emptying. They are commonly associated with benign prostate enlargement but can have other causes.
Dr. Seneth Gajasinghe
MBBS (Col), MD (Col)
SLMC No. 27329
Sineth Hospitals
Rattanapitiya, Boralasgamuwa, Sri Lanka
0 727 725 725 | info@sinethhospitals.com