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PSA Free/Total Ratio Reflex

This test is used to measure the percentage of free PSA relative to the total amount of PSA in men with serum PSA concentrations. Serum PSA levels increase due to physical changes to prostate architecture due to trauma, infection, inflammation and disease. Sensitivity of PSA levels to these changes serves as a basis for this test. Higher percentage of free PSA is associated with a lower risk of prostate cancer.

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