Direct answer: Total PSA is the amount of prostate-specific antigen measured in blood in both protein-bound and unbound forms. Free PSA is the unbound fraction. Percent-free PSA is calculated from the free and total measurements […]
Direct answer: Total PSA is the amount of prostate-specific antigen measured in blood in both protein-bound and unbound forms. Free PSA is the unbound fraction. Percent-free PSA is calculated from the free and total measurements […]

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