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Measuring your percent free PSA will help improve the accuracy of
prostate cancer detection.
PSA exists in multiple forms in the blood. Most is bound to proteins,
but some is free-floating. In the early 1990s, it was discovered that
measuring the ratio of "free" to "total" PSA could further help in
distinguishing prostate cancer from benign prostate disease.
The Hybritech® free PSA test -- also the first test of its kind to
receive approval -- helps determine the percent of free PSA. The
measurement of percent free PSA improves the accuracy of prostate cancer
detection while eliminating a projected 20 percent of all prostate
biopsies*. The free PSA test is used following a non-suspicious DRE and
a total PSA test that shows moderately elevated PSA levels (between 4
and 10 ng/mL) in men aged 50 years and older.
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