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PSA, Total and Free
MessageDo not collect specimen after a transrectal biopsy, results may be falsely elevated
Test Code
LAB171
Alias/See Also
Prostate Specific Antigen. Total and Free
Includes
PSA, Total
PSA, Free
PSA, % Free
PSA, Free
PSA, % Free
Preferred Specimen
4.5 ml (2.5 ml minimum) SST (gold) or no additive (red)
Minimum Volume
2.5 ml (1.5 ml minimum) serum
Other Acceptable Specimens
Gold SST
Instructions
After centrifugation, if not in gel barrier tube, pour off serum into an aliquot tube.
Specimen Stability
Separated from cells: 3 hours room temp, 24 hours refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Icteric: >20 mg/dL bilirubin, Hemolysis: >500 mg/dL hemoglobin, Lipemia: >1500 mg/dL triglycerides
Methodology
Immunoenzymatic
Setup Schedule
Mon- Sun
Clinical Significance
Percent free PSA may also be used for risk assessment, to determine the probability of cancer for an individual
patient. Lower percent free PSA values are associated with higher risk of cancer
patient. Lower percent free PSA values are associated with higher risk of cancer
Performing Laboratory
Piedmont Athens Regional
