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Free PSA is measured as the proportion of free PSA to total PSA. Below is a table outlining the likelihood of finding prostate cancer based on the percentage of free PSA in men with a...
An enlarged prostate and prostatitis will have a higher free PSA ratio. If your free PSA results are less than 25%, your risk for developing prostate cancer is between 10% to 20%. If your free PSA results are less than 10%, your risk for developing prostate cancer jumps to around 50%.
The ratio of your free PSAs to your overall PSA levels can give a better picture about your prostate cancer risk. The amount of free PSA is lower in men who have prostate cancer.
A free PSA test measures the level of prostate-specific antigens (PSA) that are not bound to other proteins in the blood. This helps diagnose prostate issues.
Percentage of free PSA. PSA circulates in the blood in two forms — either attached to certain blood proteins or unattached (free). If you have a high PSA level but a low percentage of free PSA , it may be more likely that you have prostate cancer.
If your PSA test result is in the borderline range (between 4 and 10), the percent-free PSA might be used to help decide if you should have a prostate biopsy. A lower percent-free PSA means that your chance of having prostate cancer is higher and you should probably have a biopsy.
PSA levels can be measured in the bloodstream, and elevated PSA levels can sometimes be a symptom of prostate cancer. So, this antigen gives doctors a starting point to evaluate your risk of having that disease. But what constitutes a normal PSA level? Why might your PSA levels be elevated?
This test measures how much of your total PSA is freely circulating. The percent-free PSA tends to be lower in people with prostate cancer.
Total prostate-specific antigen (PSA) and free PSA are performed and reported on every specimen. If the initial total PSA concentration is between 4.0 and 10.0 ng/mL, then the percent free PSA result will be calculated and reported.
The free PSA test measures the amount of unbound PSA, whereas routine tests for PSA measure both free and bound PSA or “total” amounts of PSA. PSA levels can be elevated in prostate cancer and in a variety of benign conditions including prostatitis, prostate hypertrophy, and advanced age.