Biomedical Laboratory Science

Friday, June 1, 2018

What is a free PSA test and what is it for?


"The free prostate-specific antigen test, known as the free PSA test, is used to help detect signs of prostate cancer. The test measures the level of unbound prostate-specific antigen in the blood, which can help doctors to diagnose issues like inflammation of the prostate or cancer."
Free PSA tests are often used alongside other PSA tests to confirm a diagnosis or test results. Free PSA tests can also be used instead of a biopsy if the doctor suspects prostate cancer, but a biopsy may still be needed.


This article examines when a free PSA test is used, how it differs from a total PSA test, and what the results mean.

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